Us older racers who have had a lifetime of hearing abuse have a hard time hearing you above the music. I had the volume all the way up on amplified speakers, on just a laptop I wouldn't have been to hear you at all. Otherwise one of the best videos out there.
Watching these David Vizard videos makes want to be a head porter when I grow up. The problem is, I'm already 60 years old, and don't think I'll live to be 120, at which point I may be as good as Mr. Vizard.
Dear Mr. Vizard, thank you very much for sharing your years of knowledge with us . Your data and expertise are truly appreciated by most of us I’m sure. I am by no means a professional engine builder or head porter. I am an ASE master tech, GM master tech, and transit bus technician. I am currently working in the transit arena to finish my working years. I did a little drag racing back in the 90’s and life kind of changed that over the years. I am now 55 and my 15 yo son has a very convincing interest in the sport. I have a couple of your older books from the 80’s but will be purchasing your port book for starters next week. We are planning to build a bracket car, no more than 2800 pounds finished. I have decided after discovering your power tec 10 series to go with an sbc for reasons including cost and resources. I would like to build an 11:00 to 12:00 second car using a 350 and vortec heads. Any advise you would like to offer would be greatly appreciated. Thank you sir, Paul Schott, Chewelah, WA
Beautifully presented tips, tricks and techniques. The gift of being able to visualize the behavior of fluids and prove the discussion and execution to be true with real, scientific air flow documentation. Brilliant!
I just recently found your channel and have been binge watching everything you've produced. You've already taught me so much and clarified things I thought I had and understanding of before!
I envy you, Mr Vizard. You've had the kind of career one could only dream of. Way to go, fine sir. Thank you for taking the time and sharing your knowledge with us. I also just noticed the picture of your daughter, Jacque, in the background. It immediately brought a smile to my face. I'd have a picture of my daughter, Kenzie, up, also. Thank you, again, David. Take care.
Thank you David Vizard! I built some bad ass Chevy engines back in the day because of your books! I was 18 when I rebuilt my first engine 283 for my 66 impala. After that I was hooked! The 454 beast was the baddest one!
thanks david vizard for all this teaching and technique. due to his knowledge i applied it to different head a 2 intake and 2 exhaust valve head, with the knowledge he teach in this video(the concept of airflow). my 210cc single cylinder burst 35hp@10800rpm. those number are while the valve had a knock with my piston cause of too much retard of camshaft, with little adjustment i can see probably 38hp cause the graph dip too much at 10800rpm(probably kocking), now those power figure could almost rival a moto3 spec which 250cc@50hp. i cant thank enough of his technique and theory. thank you so much david vizard, wish i can afford of going and taking his class.
I highly recommend the book as well! I bought it years ago and built a flow bench as a result. Lots of really good information, laid out in a well thought manner. I just now discovered this channel and loving the videos so far.
David.....your not allowed to get old.......!!!!! A nice vacation to the French Riviera and some good HGH shots, so as to keep educating us forever!!!!!!! A true legend!
Awesome, im porting a set of Iron LT1 police heads using these guidelines, they really are vortec heads machined to fit LT1s. With bigger valves and proper machining, Im betting they will out perform ported aluminum heads.
A good amount of detail on the effects of modifying ports and the combustion chamber. This really helped me get the most out of the recent head swap I did on my LS1 powered car.
I’m a very big fan of yours David. I have a few of your previous publications that were published by SA Designs. They are an excellent and I use and reference them frequently. I’m very pleased that you continue to pass on your years of experience and knowledge. Thank you and keep up the great work.
Damn wish this was out 3 years ago when I put some Vortecs on my El Co. I did clean up the bowl below the seat. But did not touch the pinch point as I read not to screw with the shape of the port. Did open the intake side of the chamber similar to what he did more towards the plug boss and rounded them as well needing take CCs out for pump gas. Like his method if taking most of the Intake side of the plug boss better. Went with a squishy engine . Stock piston pin height so stock deck height ...020-025 and added a .015 shim gasket. I did smooth our the edges if the chamber to hopefully keep any hot spot edges from happening because I am a little over 10:1 C/R. (No problems with ping!) I did clean up the bowl in the exhaust side and the port some reading they flow not all that good. However Vizard says better than the old GM heads. Did not back cut my valves ..Shiot! Great info and glad I did do some similar things he did!! Engine runs well!
Thanks for the great video, David. It's great that you are sharing your vast and impressive knowledge of cylinder head porting. You are a good teacher. The only thing you might consider to improve future videos is to either lower or remove the background music, as it makes it a little hard to listen you what you are saying. Thanks again.
Very informative video David, great explanations for each step. I have enjoyed porting A and B series BMC engines and Kent series engines for years by simply following your well known books. Only negative I can put forward is the music, it is a bit distinctive and annoying.
Love your videos the only thing that drives me crazy is the light music playing, which wouldn't be problem if you we're wearing a mic, it would make your videos even better.
People always wondered how I make the power i have made over the years with just what i have lol well just go buy the mans books cause I have bought just about every book this man has out lol. You just got to understand what he is saying an not think it's easy. He is is a mad scientist with an engine. Trust me this man is the best an I have made so power with junk from reading this mans books. I have books from David for over 20years now.
I wish he had been wearing a lapel microphone, it is very hard to hear what he's saying because the echo is bad and the background music. This great info but only if we can hear it.
Great to see you're still around & doing good works with your Vizardry. 'How to Modify Your Mini' - the holy bible of my generation, I'm almost word perfect.
When will you go over the exhaust side of the vortec heads other than that the video is the best most sensible videos on porting vortec heads. I have several books by David and I plan to buy several more trying to build a library of his books.
Hi David. In a later video, can you show some reverse flow figures for a cylinder head? That is, when the intake valve is used as an exhaust, and vice-versa. Would be very interesting to compare the ratio of forward to reverse flow figures, and see what can be done to improve that ratio, so that reverse flow is decreased without decreasing (or even increasing) forward flow.
I was waiting for something to be posted for ages! When something this relevant and useful comes along I simply shared the video link to other social media. Maybe others did the same?What happened to "Power Tec 10 EP4"? You will find a consistently larger audience if you post something regular such as weekly. And even if you make a simple video of your daily/weekly engine builds/tech/research/titbits of info. It will all add up to a regular following. Even consider working through your books but backed up with practical?
Thank you. Great video. Nicely organized and well explained. I would like to try my hand at doing some port work. I have done some casting clean up nothing major.
did u actually watch him deshroud the intake valve? open the throats, display his results on a flowbench, show you what NOT to do (and again prove it on the flow bench?). You need to realize who you are talking about - this guys a legend. You just embarrassed yourself belittling this guy. He wrote a program to optimize funny car heads and held workshops for pro engine builders - do you actually have any idea who this guys is and what kid of knowledge that takes? obviously you dont.. im grinding because of my absolute appreciation for this guy and what he has given to an entire generation of hotrodders, from kids to grandpa's- back in the 90s his daughter bought his book, just BOUGHT, no internet - they were beating 2.5/3L cobra GT's in a 1.1L mini car - thats like making a 229 GM out perform a 400!
David, thanks so much for the straight talk on head porting. Wonderful! Do you still offer a head porting service? I am restoring a 89 454 dually with only for thousand miles on the clock and would like to get the best possible head work performed on it's peanut port heads. Thanks, Grant.
David - I've been reading your articles since the '80s After I watched this video, I bought your porting book. I should have bought it a long time ago Now I'm going to buy some Vortec heads for my truck engine I already have some Dart 165 heads and the design of those differs from the Vortecs, enough that it leaves me with a few questions before I begin working on those. Is it nessecary to participate in your seminar to get answers to questions on Dart iron 165 heads? Do you ever do webinars? Thanks for the best video to be found, on porting.
Pretty sure he's covered them extensively in previous books, namely 'How to Modify Ford SOHC engines" m.barnesandnoble.com/w/how-to-modify-ford-sohc-engines-david-vizard/1002195846 Barnes & Noble has it for $31.95. You might even be able to find it on Google Books and get the digital copy.
I was told for optimum flow, you want the valve opening to be 0.85% the size of the port opening, or rather the port opening should be made to this size
So you are talking less than 1% as being optimum, or is that a typo ? Either way it seems to me as a port developer you what 100% past the valve, how can less than that be optimal ?
David, I just now saw this, great information! The question I have is do you know if these same techniques can be applied to the Dart Vortec heads, or are they just that much better than the factory vortec heads?
Would having done the choke point after the valve mod have shown a better number? ..maybe as an overall? since the valve portion of the chamber is more efficient. can the reduced velocity of the chock point reduction be over come? thanks
David,great video! The sound track is ok but way to loud to hear what you are talking about.The sound track should barely heard.Besides you aren't dull and boring or have a monotone voice. Thanks so much..I bought a a few of your books...All treasures!
i am struggling hearing David over the music,, Is it Possible to do this porting on the L31 heads without the Flow Bench just by watching this Video...
is it good for me to port match my intake to my gaskit?becouse the runners are alot smaller than the vortec gaskit.also the heads runner is also smaller than the gaskit so is it a good then to do that much thanks tom
What type of horsepower and torque gains have you seen or roughly predict a set of Vortec 062 heads on a COMPLETELY STOCK L31 Vortec engine gain??? I am VERY Interested in a complete L31 Vortec rebuild for my 96 C1500 std Cab Short Bed 2WD truck. My goal is to keep 100% stock except full porting heads, improved spider fuel injection system and dual exhaust using headers, proper exhaust pipe diameter for best back pressure, scavenging, delete catalytic converters and a custom tune to the parameters of the build. Also my transmission is a stock 4l60e with a Heavy Duty rebuild with the improved sun shell, harden plate and other minor improvements along with corvette servo. My goal is to create a factory reliable performance drive train that can be driven daily. Hopefully this info could give you some idea on the vehicle. The rear differential is a 3.08 gear open. I am wondering if something like this was done? It would be interesting to see what a 100% stock L31 is capable of without internal upgrades other than head porting and the external improvements I mentioned. Thank you!
This guy is amazing in so many things hes talks about but for my thirty-some years in porting heads with a flow bench head scanner and analyzer so I can see how thick the head really is so I know how much metal to remove there's a lot of things I learned he does not mention 5 angle race cut and a lot of other tricks I ain't going to mention LOL besides nobody uses those heads for 20 years already it's all about the ls heads and them worthless hemi heads coyote heads are pretty decent but if you want horsepower LS is the way to go
I was introduced to this channel by Uncle tony's garage. I realize now i bought your " How to rebuild the chevy small block" book back in the 90's. David if you don't mind me asking; What is the apparatus with the metal ball you are using as a pointer in this video? what is that called? and where can i get one?
i started modifying mini 'a' series engines about 45 years ago based on your books and develope a few ideas of my own along the way.. I also met you once when you signed yours books for me .. turned it into a BIZ since then and won many championships .. i ow it to you .. great video but in the early part it could have done with you using a pen to point at areas and not the torch .. JUST A SHAME YOU ARE NOT IN THE UK ANY MORE...
WELL THANKS FOR THE COMPLIMENT AND I AM REALLY PLEASED THAT MY WORK WAS A HELP TOWARD YOU GOING PRO. AS FOR THE LIGHTING THAT WAS AN ATTEMPT TO DO SOMETHING DIFFERENT.
Which books do you have? "How to port & flow test cylinder heads"? You may want to search online for info about the Poly quad head, also. Here's one online article to check out. This info may be in his book. I have no idea. www.motortecmagazine.net/the-future-of-4-valve-engines/
JC btw I have seen David’s porting book and he touches on this same article that you’ve provided. But the articles goes way more in depth than the book does, at least for 4 valves per cylinder engines.
Why is the valve lift so short why don't you have it at 500 550 half an inch would increase velocity air flow should I be aiming for 600. I'm never to sure to go for performance Cam or touring cam you in UK whereabouts are you based
Us older racers who have had a lifetime of hearing abuse have a hard time hearing you above the music. I had the volume all the way up on amplified speakers, on just a laptop I wouldn't have been to hear you at all. Otherwise one of the best videos out there.
Watching these David Vizard videos makes want to be a head porter when I grow up.
The problem is, I'm already 60 years old, and don't think I'll live to be 120, at which point I may be as good as Mr. Vizard.
Dear Mr. Vizard, thank you very much for sharing your years of knowledge with us . Your data and expertise are truly appreciated by most of us I’m sure. I am by no means a professional engine builder or head porter. I am an ASE master tech, GM master tech, and transit bus technician. I am currently working in the transit arena to finish my working years. I did a little drag racing back in the 90’s and life kind of changed that over the years. I am now 55 and my 15 yo son has a very convincing interest in the sport. I have a couple of your older books from the 80’s but will be purchasing your port book for starters next week. We are planning to build a bracket car, no more than 2800 pounds finished. I have decided after discovering your power tec 10 series to go with an sbc for reasons including cost and resources. I would like to build an 11:00 to 12:00 second car using a 350 and vortec heads. Any advise you would like to offer would be greatly appreciated. Thank you sir, Paul Schott, Chewelah, WA
Beautifully presented tips, tricks and techniques. The gift of being able to visualize the behavior of fluids and prove the discussion and execution to be true with real, scientific air flow documentation. Brilliant!
Bought his book horse power on a budget. Best purchase I ever made
I just recently found your channel and have been binge watching everything you've produced. You've already taught me so much and clarified things I thought I had and understanding of before!
Who gives this a thumb down ? ......
Thank you David Vizard for taking the time to share information
A true master of engine airflow ....David Vizzard
David Vizard is the "vortec head whisperer"! He knows how to wake up an already awesome pair of vortec heads up! EVEN MORE!!
David read most of your books. You have taught me soooo much. You and smokey yunick are my heroes!!
Smokey was one of my heroes as well. I got to spend some quality time with him --- just not enough though.
I envy you, Mr Vizard. You've had the kind of career one could only dream of. Way to go, fine sir. Thank you for taking the time and sharing your knowledge with us.
I also just noticed the picture of your daughter, Jacque, in the background. It immediately brought a smile to my face. I'd have a picture of my daughter, Kenzie, up, also.
Thank you, again, David. Take care.
Mr. Vizard, you have us hooked. Now we are waiting for part 2. Bigger valves and exhaust porting!!!!!!!!
Thank you David Vizard! I built some bad ass Chevy engines back in the day because of your books! I was 18 when I rebuilt my first engine 283 for my 66 impala. After that I was hooked! The 454 beast was the baddest one!
thanks david vizard for all this teaching and technique. due to his knowledge i applied it to different head a 2 intake and 2 exhaust valve head, with the knowledge he teach in this video(the concept of airflow). my 210cc single cylinder burst 35hp@10800rpm. those number are while the valve had a knock with my piston cause of too much retard of camshaft, with little adjustment i can see probably 38hp cause the graph dip too much at 10800rpm(probably kocking), now those power figure could almost rival a moto3 spec which 250cc@50hp. i cant thank enough of his technique and theory. thank you so much david vizard, wish i can afford of going and taking his class.
Hi David, great Video, simple terms, and nice to see you have not lost your Gloucestershire accent after all those years over the pond.
We first met around 1987, tuning the A series. Great video, I watch twice to try and absorb the info. Many thanks
I highly recommend the book as well! I bought it years ago and built a flow bench as a result. Lots of really good information, laid out in a well thought manner. I just now discovered this channel and loving the videos so far.
It is sometimes hard to hear what mr. Wizard is saying and the reason is the unnecessary background "music"
Also needs a lapel mic. His voice range changes up and down and there's echo in the room
David.....your not allowed to get old.......!!!!!
A nice vacation to the French Riviera and some good HGH shots, so as to keep educating us forever!!!!!!! A true legend!
Awesome, im porting a set of Iron LT1 police heads using these guidelines, they really are vortec heads machined to fit LT1s. With bigger valves and proper machining, Im betting they will out perform ported aluminum heads.
As always your technical advice is the bee's knee's! And the music had me mellow, attentive and subdued.
Fantastic information David. You back absolutely everything you profess with real world data. Thank you for sharing your knowledge with the masses.
Busy porting my vortecs today - thanks David - you are a LEGEND builder and I wish I grew up next door to you!!
Wow really great, detailed info. Need more like this. I'm a long time David Vizard fan.
Me too, I remember he wrote articles in motorcycle magazines in late 60's early 70's dealing with British bikes then later japanese stuff
A good amount of detail on the effects of modifying ports and the combustion chamber. This really helped me get the most out of the recent head swap I did on my LS1 powered car.
Great video. Desperately need the follow up video of exhaust porting please 👍
I’m a very big fan of yours David. I have a few of your previous publications that were published by SA Designs. They are an excellent and I use and reference them frequently. I’m very pleased that you continue to pass on your years of experience and knowledge. Thank you and keep up the great work.
Ive used info from SA Design books that david vizard co wrote and had real success. Gotta love it.
Damn wish this was out 3 years ago when I put some Vortecs on my El Co. I did clean up the bowl below the seat. But did not touch the pinch point as I read not to screw with the shape of the port. Did open the intake side of the chamber similar to what he did more towards the plug boss and rounded them as well needing take CCs out for pump gas. Like his method if taking most of the Intake side of the plug boss better. Went with a squishy engine . Stock piston pin height so stock deck height ...020-025 and added a .015 shim gasket. I did smooth our the edges if the chamber to hopefully keep any hot spot edges from happening because I am a little over 10:1 C/R. (No problems with ping!) I did clean up the bowl in the exhaust side and the port some reading they flow not all that good. However Vizard says better than the old GM heads. Did not back cut my valves ..Shiot! Great info and glad I did do some similar things he did!! Engine runs well!
a good 30* back cut really helps low lift flow. A performance valve job and a little bowl work and you'll outperform Vizard's heads.
Thanks for the great video, David. It's great that you are sharing your vast and impressive knowledge of cylinder head porting. You are a good teacher. The only thing you might consider to improve future videos is to either lower or remove the background music, as it makes it a little hard to listen you what you are saying. Thanks again.
Yep, I bought your Port and Flow test when it came out. Lots of information that transfers to the old Honda bikes I play with
Thank you David and staff for informing us and debunking the internet wrong doings.
Thanks for showing telling of the 50 years , have a great day and well see ya next time see ya bye bye.
Very good vid David about time someone that knows whats going on ! just turn down the background music a little please.
Very informative video David, great explanations for each step. I have enjoyed porting A and B series BMC engines and Kent series engines for years by simply following your well known books.
Only negative I can put forward is the music, it is a bit distinctive and annoying.
Love your videos the only thing that drives me crazy is the light music playing, which wouldn't be problem if you we're wearing a mic, it would make your videos even better.
People always wondered how I make the power i have made over the years with just what i have lol well just go buy the mans books cause I have bought just about every book this man has out lol. You just got to understand what he is saying an not think it's easy. He is is a mad scientist with an engine. Trust me this man is the best an I have made so power with junk from reading this mans books. I have books from David for over 20years now.
Dave that was great info but can you get rid of that background ice cream truck music
i agree
This is not about engines, its about terrible music.
I can't spend time listening to it, I'm done with this guy.
I like ice cream, besides David is so engaging, I didn't notice it much at all.
Great information ...I have several Vortec heads to practice on
I wish he had been wearing a lapel microphone, it is very hard to hear what he's saying because the echo is bad and the background music. This great info but only if we can hear it.
They should have muted background music.
I did that drill thing on a grinder when I was a poor teenager to back-cut the valves when porting my camel hump heads.
Great to see you're still around & doing good works with your Vizardry. 'How to Modify Your Mini' - the holy bible of my generation, I'm almost word perfect.
Part 2 coming soon? This is the most-informative porting video I've seen. Great job, fellas.
totally agree with the comment below, no need for background music. otherwise, great content :)
Great video David, very informational and I enjoyed the detailed step by step explanations
When will you go over the exhaust side of the vortec heads other than that the video is the best most sensible videos on porting vortec heads. I have several books by David and I plan to buy several more trying to build a library of his books.
Hi David, thanks for posting very informative!
Great! Very usefull tech info for N/A fans!
Hi David. In a later video, can you show some reverse flow figures for a cylinder head? That is, when the intake valve is used as an exhaust, and vice-versa. Would be very interesting to compare the ratio of forward to reverse flow figures, and see what can be done to improve that ratio, so that reverse flow is decreased without decreasing (or even increasing) forward flow.
I've had those books for years even though I've never had a V-8 or Chevy. Interesting reading that translates to most OHV engines
I know this post is old but by any chance can you tell me where to find his books especially on the vortec heads thank you
@@johngray2526 I got them from Booksamillion or somewhere similar. They are by SA Design/Car-Tech. wwwcartechbooks.com
Wonderful video. Lots of good information
SOME GOOD INFO THERE THANKS THAT WILL HELP ME ON MY VORTEC HEADS
Great info. Looking forward to valve size increase to 2.02/1.60 and for exhaust work video. When will these be completed?
this is how you get real intell darn good video
I was waiting for something to be posted for ages! When something this relevant and useful comes along I simply shared the video link to other social media. Maybe others did the same?What happened to "Power Tec 10 EP4"? You will find a consistently larger audience if you post something regular such as weekly. And even if you make a simple video of your daily/weekly engine builds/tech/research/titbits of info. It will all add up to a regular following. Even consider working through your books but backed up with practical?
Outstanding! Thanks David.
Thank you. Great video. Nicely organized and well explained. I would like to try my hand at doing some port work. I have done some casting clean up nothing major.
most of what this shows us is the vortec heads are brilliant as cast and need next to zero port work.
did u actually watch him deshroud the intake valve? open the throats, display his results on a flowbench, show you what NOT to do (and again prove it on the flow bench?). You need to realize who you are talking about - this guys a legend. You just embarrassed yourself belittling this guy. He wrote a program to optimize funny car heads and held workshops for pro engine builders - do you actually have any idea who this guys is and what kid of knowledge that takes? obviously you dont.. im grinding because of my absolute appreciation for this guy and what he has given to an entire generation of hotrodders, from kids to grandpa's- back in the 90s his daughter bought his book, just BOUGHT, no internet - they were beating 2.5/3L cobra GT's in a 1.1L mini car - thats like making a 229 GM out perform a 400!
David, thanks so much for the straight talk on head porting. Wonderful! Do you still offer a head porting service? I am restoring a 89 454 dually with only for thousand miles on the clock and would like to get the best possible head work performed on it's peanut port heads. Thanks, Grant.
I was reading your work growing up 👍😎👌
Chaaa the brilliant man himself in living colour.
David - I've been reading your articles since the '80s
After I watched this video, I bought your porting book. I should have bought it a long time ago
Now I'm going to buy some Vortec heads for my truck engine
I already have some Dart 165 heads and the design of those differs from the Vortecs, enough that it leaves me with a few questions before I begin working on those.
Is it nessecary to participate in your seminar to get answers to questions on Dart iron 165 heads?
Do you ever do webinars?
Thanks for the best video to be found, on porting.
The master dropping truth bombs.
Excellent! I´ve been waiting this kind of tutorial videos from the channel for long! Thank you!!! Please do more about Ford Lima / Pinto series
Pretty sure he's covered them extensively in previous books, namely 'How to Modify Ford SOHC engines"
m.barnesandnoble.com/w/how-to-modify-ford-sohc-engines-david-vizard/1002195846
Barnes & Noble has it for $31.95. You might even be able to find it on Google Books and get the digital copy.
Very good, but please use a headset microphone to avoid the echo effect. And as pointed out, skip the music.
@ David Vizard Performance can you please edit this videos audio output so we can hear you speaking.
Thanks DV! A fantastic video!!!
Hey Dave if this head was setup with a 2.02 valve wouldn’t it reduce the size of the area you filled with clay?
I was told for optimum flow, you want the valve opening to be 0.85% the size of the port opening, or rather the port opening should be made to this size
So you are talking less than 1% as being optimum, or is that a typo ? Either way it seems to me as a port developer you what 100% past the valve, how can less than that be optimal ?
complete brilliance!
David, I just now saw this, great information! The question I have is do you know if these same techniques can be applied to the Dart Vortec heads, or are they just that much better than the factory vortec heads?
Mr. Vizard have you ever done anything with Pontiac cylinder heads?
Would having done the choke point after the valve mod have shown a better number? ..maybe as an overall? since the valve portion of the chamber is more efficient. can the reduced velocity of the chock point reduction be over come? thanks
hi david another great video , thank you
David,great video! The sound track is ok but way to loud to hear what you are talking about.The sound track should barely heard.Besides you aren't dull and boring or have a monotone voice. Thanks so much..I bought a a few of your books...All treasures!
Amazing video really usefull
i am struggling hearing David over the music,, Is it Possible to do this porting on the L31 heads without the Flow Bench just by watching this Video...
is just polishing good to do when i dont have a set up like you and im a beginner ? Will only polishing help ?
No. Shape is far more important
Polishing the exhaust and chamber helps, just not much when you consider the time spent.
good education….thanks!
is it good for me to port match my intake to my gaskit?becouse the runners are alot smaller than the vortec gaskit.also the heads runner is also smaller than the gaskit so is it a good then to do that much thanks tom
Thanks for the info.
What type of horsepower and torque gains have you seen or roughly predict a set of Vortec 062 heads on a COMPLETELY STOCK L31 Vortec engine gain??? I am VERY Interested in a complete L31 Vortec rebuild for my 96 C1500 std Cab Short Bed 2WD truck. My goal is to keep 100% stock except full porting heads, improved spider fuel injection system and dual exhaust using headers, proper exhaust pipe diameter for best back pressure, scavenging, delete catalytic converters and a custom tune to the parameters of the build. Also my transmission is a stock 4l60e with a Heavy Duty rebuild with the improved sun shell, harden plate and other minor improvements along with corvette servo. My goal is to create a factory reliable performance drive train that can be driven daily. Hopefully this info could give you some idea on the vehicle. The rear differential is a 3.08 gear open. I am wondering if something like this was done? It would be interesting to see what a 100% stock L31 is capable of without internal upgrades other than head porting and the external improvements I mentioned. Thank you!
You said next is the exhaust. Then the next episode you did is on SBF. When will you do the Vortec exhaust?
What's the effect of gains in flow vs losses of compression
you could easily make up loss in compression by using thinner headgaskets or domed pistons. i would rather lose 5-10cc and gain flow.
Nice job....thanks!
This guy is amazing in so many things hes talks about but for my thirty-some years in porting heads with a flow bench head scanner and analyzer so I can see how thick the head really is so I know how much metal to remove there's a lot of things I learned he does not mention 5 angle race cut and a lot of other tricks I ain't going to mention LOL besides nobody uses those heads for 20 years already it's all about the ls heads and them worthless hemi heads coyote heads are pretty decent but if you want horsepower LS is the way to go
Would love to take his 3 day seminar , porting my 440 heads on my channel easy does it , and i admire this man👍
I was introduced to this channel by Uncle tony's garage. I realize now i bought your " How to rebuild the chevy small block" book back in the 90's. David if you don't mind me asking; What is the apparatus with the metal ball you are using as a pointer in this video? what is that called? and where can i get one?
Good information for me.
i started modifying mini 'a' series engines about 45 years ago based on your books and develope a few ideas of my own along the way.. I also met you once when you signed yours books for me .. turned it into a BIZ since then and won many championships .. i ow it to you .. great video but in the early part it could have done with you using a pen to point at areas and not the torch .. JUST A SHAME YOU ARE NOT IN THE UK ANY MORE...
WELL THANKS FOR THE COMPLIMENT AND I AM REALLY PLEASED THAT MY WORK WAS A HELP TOWARD YOU GOING PRO.
AS FOR THE LIGHTING THAT WAS AN ATTEMPT TO DO SOMETHING DIFFERENT.
EXCELLENT !!!
SOMTIMES IV FOUND FACTORY IS HARD TO INPROVE UPON U HAVE GOT THE REALIZE HOW MUCH TIME THEASE GUY PUT INTO TESTING THIS STUFF
I have few Your books but there are very little information about pent-roof 4 valve engines, do You plan anything about that?
Which books do you have? "How to port & flow test cylinder heads"? You may want to search online for info about the Poly quad head, also. Here's one online article to check out. This info may be in his book. I have no idea.
www.motortecmagazine.net/the-future-of-4-valve-engines/
JC thanks so much for the info!!!
JC btw I have seen David’s porting book and he touches on this same article that you’ve provided. But the articles goes way more in depth than the book does, at least for 4 valves per cylinder engines.
VORTEC G.O.A.T
Why is the valve lift so short why don't you have it at 500 550 half an inch would increase velocity air flow should I be aiming for 600.
I'm never to sure to go for performance Cam or touring cam you in UK whereabouts are you based
Great!!!
Megustaria las explicaciones en español
Great information. For future reference. Please keep the music off. It was very distracting, and made it hard to follow what you was saying.
why is sound quality so bad cant hear you
Good video ,use some kind of pointer not your finger
yeah, F1, riiiigght