This is EXACTLY what I needed to know. I have a 8.1 in my boat in need of a full rebuild. The choice was to switch it out or rebuild a cost effectively reliable 600HP engine. As you are fully aware there are not many aftermarket HP products for the 8.1. The market seems to have dismissed theses engines. After watching your video...Decision made!! Thanks so much for this great video!
@amosgarcia9152 Awesome! Glad it helped out, that step adds about a day to the process but you get a really good understanding of what is there stock and what could be improved. Good Luck!
@@CarswellsCustoms I appreciate it. Looking forward to the answer. As I understand it, the heads were originally designed for a 4.5" bore and so the 4.25" bore chokes down flow and contributes to the valve shrouding issue.
On the exhaust side the guide boss flat face and girth not only restrict the flow they s deflection across the port that blows up the high volume flow path out of the head. I would shape the boss more while increaseing the tunneling on both sides of the boss
flow bench a tool, numbers a input not a given.most important will be velocity and throat idk what those castings would want just seeing the chamber there is alot to be had there best tool to have are flow balls all your numbers will come from 1 inch above and below the valve I wouldn't have went with a bigger intake especially 2300 to bring the throat big enough to benefit that big of a valve also what is the bore there are so many variables . I'm nobody to anyone but but I do have a lot of experience in cylinder head porting and engine building your headed the right way but you do not need that big of a valve there is not enough port area to make a 2300 valve work .89% is a good start of valve area for throat numbers depending on where you want to build power also how that port& bowl shape with line of sight to the valve I believe your valve job has alot on the table still a when u say 4 angle what are those angles and where they sit is very important also great plan on keeping the 2.19 go up I would cut the exauust to a bigger valve and bowl work chamber work cut the valve job for what it wants not what I want that goes for the port to the only reason I would flow these would be to get a number and velocity . The last Gen 7 I built with factory castings with a custom sheet metal intake I ended up building 3 intakes for three different builds and combos two drag cars 1mud truck / mud drags . The last one in a drag and drive made just shy of 800 I can't recall the exact number but I will say it had over 12,1 comp had a healthy cam in duration lift was not huge the engine lived on pump fuel with a 85 percent of its life being cruised from drag strip to drag strip . I have not used a camshaft off the shelf in over 30 yrs in my 34 yrs of building high performance race engines I cut my teeth at a family members automotive machine shop learned more then most was lucky enough to grow up in a time where horsepower and anything to do with it had secrets no one talked or told them . If you wanted the engine out of my car/truck/motorcycle you couldnt afford it .if they did shell out the astronomical dollar i put on any of my personal engines it was back to the drawing board to be competitive. Like the video great work you earn a sub here my apologies for writing a book . I was fed greasy cast iron shavings from the age of 12 I worked for my uncle in one of the top 3 states for motorsports especially drag and road or round racing the shop lived in the race track back yard all I wanted to do was port heads,run the super flow 110 or 600 , balance rotating assembly, blueprint blocks and oil systems gap rings measure tolerances down to the tenth of a thousandth,weld up headers and intakes..but tbt 75% of the work was factory rebuilds so I would give free work to customers who would let me buy getting promissory to do the work with the guidance of a master at all. We did it all from a couple independent top fuel teams to grandma's vw bus .. I do not know everything nore do I claim to I still learn every day . I would say good luck on the build but my uncle taught me a long time ago its not luck when it comes to horsepower its knowledge and skill that makes the number.. he is 💯 right oh yeah p.s if your not throwing rods while trying to win a race your not trying hard enough all engines puke there guts out one way or another it depends how far you will go to find that threshold and learn from it do not go forward until you absolutely know how what and why plus how to better it along with everything around it a engines biggest contributing factor to failure is what answer that one and I'll get back to you.... very few have answered this correctly
Thats great info thank you! I am designing a Gen7 intake to cast. I also have a machinist kicking out some intake flanges to weld up a sheetmetal intake. Email me at mymusiconmyiphone@gmail.com and I will share some solidworks images and maybe you can give me some tips!
Updates? I would like to see someone build a 10:1 or 11:1 piston. I bought one of these motors recently and wish I would have went with the 454 vortec instead cuz there's a lot more parts for cheaper cost people are making 650hp with a 10:1 496 old school block.
@affordableperformance6259 Getting close, I am designing a sheetmetal intake and a fully casted intake for the 8.1. I agree its easy to build HP with any BBC, but the cylinder heads on the 8.1 are great for the entry level price in a Junk Yard - better than peanut port heads on 7.4's. You can find a dart intake on FB Marketplace for $900 and that intake allows a old school distributor so parts are out there just hard to find. Vids to come soon on my sheetmetal intake installed and running on my 8.1.
This is EXACTLY what I needed to know. I have a 8.1 in my boat in need of a full rebuild. The choice was to switch it out or rebuild a cost effectively reliable 600HP engine. As you are fully aware there are not many aftermarket HP products for the 8.1. The market seems to have dismissed theses engines. After watching your video...Decision made!! Thanks so much for this great video!
@gxb930 Great, glad to help out!
Doing a port job on an 8.1 was nice to see you port molds. Helps a lot.
@amosgarcia9152 Awesome! Glad it helped out, that step adds about a day to the process but you get a really good understanding of what is there stock and what could be improved. Good Luck!
Thanks for sharing this! Are you going to do the 8.1 intake behind you? 👍
@Sterling Tomlin I did not plan on porting or flowing the stock intake. But I am designing a carb and supercharger intake for the 8.1!
Great Video. Thank you!
@ohfugit Awesome, glad it helped out!
Was the stock 4.25" bore used for the flow testing?
Great video. Thanks for sharing!
@calebcross7348 Gosh, I really dont remember. I will have to ask the flow tester. Thank you!
@@CarswellsCustoms I appreciate it. Looking forward to the answer.
As I understand it, the heads were originally designed for a 4.5" bore and so the 4.25" bore chokes down flow and contributes to the valve shrouding issue.
Love the intro
Thank you!
On the exhaust side the guide boss flat face and girth not only restrict the flow they s deflection across the port that blows up the high volume flow path out of the head. I would shape the boss more while increaseing the tunneling on both sides of the boss
Thank you!
flow bench a tool, numbers a input not a given.most important will be velocity and throat idk what those castings would want just seeing the chamber there is alot to be had there best tool to have are flow balls all your numbers will come from 1 inch above and below the valve I wouldn't have went with a bigger intake especially 2300 to bring the throat big enough to benefit that big of a valve also what is the bore there are so many variables . I'm nobody to anyone but but I do have a lot of experience in cylinder head porting and engine building your headed the right way but you do not need that big of a valve there is not enough port area to make a 2300 valve work .89% is a good start of valve area for throat numbers depending on where you want to build power also how that port& bowl shape with line of sight to the valve I believe your valve job has alot on the table still a when u say 4 angle what are those angles and where they sit is very important also great plan on keeping the 2.19 go up I would cut the exauust to a bigger valve and bowl work chamber work cut the valve job for what it wants not what I want that goes for the port to the only reason I would flow these would be to get a number and velocity . The last Gen 7 I built with factory castings with a custom sheet metal intake I ended up building 3 intakes for three different builds and combos two drag cars 1mud truck / mud drags . The last one in a drag and drive made just shy of 800 I can't recall the exact number but I will say it had over 12,1 comp had a healthy cam in duration lift was not huge the engine lived on pump fuel with a 85 percent of its life being cruised from drag strip to drag strip . I have not used a camshaft off the shelf in over 30 yrs in my 34 yrs of building high performance race engines I cut my teeth at a family members automotive machine shop learned more then most was lucky enough to grow up in a time where horsepower and anything to do with it had secrets no one talked or told them . If you wanted the engine out of my car/truck/motorcycle you couldnt afford it .if they did shell out the astronomical dollar i put on any of my personal engines it was back to the drawing board to be competitive. Like the video great work you earn a sub here my apologies for writing a book . I was fed greasy cast iron shavings from the age of 12 I worked for my uncle in one of the top 3 states for motorsports especially drag and road or round racing the shop lived in the race track back yard all I wanted to do was port heads,run the super flow 110 or 600 , balance rotating assembly, blueprint blocks and oil systems gap rings measure tolerances down to the tenth of a thousandth,weld up headers and intakes..but tbt 75% of the work was factory rebuilds so I would give free work to customers who would let me buy getting promissory to do the work with the guidance of a master at all. We did it all from a couple independent top fuel teams to grandma's vw bus .. I do not know everything nore do I claim to I still learn every day . I would say good luck on the build but my uncle taught me a long time ago its not luck when it comes to horsepower its knowledge and skill that makes the number.. he is 💯 right oh yeah p.s if your not throwing rods while trying to win a race your not trying hard enough all engines puke there guts out one way or another it depends how far you will go to find that threshold and learn from it do not go forward until you absolutely know how what and why plus how to better it along with everything around it a engines biggest contributing factor to failure is what answer that one and I'll get back to you.... very few have answered this correctly
Thats great info thank you! I am designing a Gen7 intake to cast. I also have a machinist kicking out some intake flanges to weld up a sheetmetal intake. Email me at mymusiconmyiphone@gmail.com and I will share some solidworks images and maybe you can give me some tips!
Great Video!
Thank you!
Updates? I would like to see someone build a 10:1 or 11:1 piston. I bought one of these motors recently and wish I would have went with the 454 vortec instead cuz there's a lot more parts for cheaper cost people are making 650hp with a 10:1 496 old school block.
@affordableperformance6259 Getting close, I am designing a sheetmetal intake and a fully casted intake for the 8.1. I agree its easy to build HP with any BBC, but the cylinder heads on the 8.1 are great for the entry level price in a Junk Yard - better than peanut port heads on 7.4's. You can find a dart intake on FB Marketplace for $900 and that intake allows a old school distributor so parts are out there just hard to find. Vids to come soon on my sheetmetal intake installed and running on my 8.1.
Its all for naught if the ports arent matched with the manifolds right
Understood.
Good video
Thank you!
Love the intro
Thank you!
Love the intro
Thank you!