I'd love to see you port them to see how they compare to the aftermarket offerings!! Especially if you just did the bowls, short turns and your valvejob!! Like a minimalist effort.
I probably should. It may have been done before, but I tried to give honest answers, even if companies give me products. My gut says when I port the stock ones they will make close to or more than the aftermarket heads.
We just used those on my son’s 6.0L with a truck Norris cam, it’s not crazy choppy, sounds good, no performance numbers as of yet though, we just finished it
Careful with 400+ BTR cam/spring combo with solid truck valves. At redline they can slap and snap the valve stems. You need 821 hollow stem IN valves for that cam.
If it were up to you, would you have high swirl at low lift, tapering off at higher lift, linearly increasing swirl with lift, or just steady high swirl throughout the lift curve?
I have a set of 821 heads I need ro refresh for a Ls3/6L90E swap I am working on. In a 03'Crown Vic Police Interceptor. It's a project with my grandkids.
So this is all static, which is good data. How does it change when you go to dynamic and actually have volume change, the time component, squish? Would the rpm for the swirl be affected a lot or does it really matter? Great vids!
Internet gear heads say the 821 and 823 are the same castings. The difference in the 821 is 3 angle valve job and higher intake valves. 823 heavier intake and 2 cut valve job. Any clarification would be helpful.
@6.liter-beater its stjll wrong. 823s are LS3 rectangle ports. There is no shch thing as an 823 cathedral Port. Perhaps youre confusing the. Witb 8-FIFTY-3 heads
Speaking of the seats, I'm an Australian, but I see Matt at MBE uses that stuff he swears by. I never see anyone talking about risk mitigation using that awful metal that they use. I personally wouldn't risk it, hell you don't port iron heads and I assume because you were getting elevated iron levels, might want to check into your alloy levels budy, look after your self.
Calculating CSA is overrated, the radius in the port makes it difficult to accurately measure the length anyway, because you have to translate the curve to a straight line to get the true length. Appreciate the air speed measurements.
This is what ive been waiting for.The ls guys keep telling me they can take a salvage engine and make big power without buying aftermarket heads.
There's 100's of thousands of guys doing it and videos of it all over
Yep, ^, as sajd above, for almost 20 years now. Really good for around the last 10-15 when guys finally figured out how to cam them.
I have 2 cars with junkyard 5.3s with superchargers/turbos both making over 1khp for YEARS. Not just one track pass. So where's the lie?
Like there's only one LS head😂 ....
@@Kincentcpost some
Videos
Wow man thank you very much, awesome info brother 👍🏻
I'd love to see you port them to see how they compare to the aftermarket offerings!!
Especially if you just did the bowls, short turns and your valvejob!! Like a minimalist effort.
That's been done since these heads hit the market
I probably should. It may have been done before, but I tried to give honest answers, even if companies give me products. My gut says when I port the stock ones they will make close to or more than the aftermarket heads.
@@WeingartnerRacing Your honest and professional opinion is why I and I'm sure many others are here. Thank you for what you're doing!!
We just used those on my son’s 6.0L with a truck Norris cam, it’s not crazy choppy, sounds good, no performance numbers as of yet though, we just finished it
Really looking forward to seeing the dyno sessions.
Me too
Some 823 heads came on the truck ly6 6 liter. I read somewhere that the 821 and 823 rec port heads are similar but the 821s had sodium filled valves
Hollow stem for 821, Camaro and Vettes.
I miss the cylinder head porting tech videos. Your dyno videos are better than most because you try to explain why, not just show numbers if possible.
I will try to do those again but I felt like I was beating a dead horse
Careful with 400+ BTR cam/spring combo with solid truck valves. At redline they can slap and snap the valve stems. You need 821 hollow stem IN valves for that cam.
Solid stems are always stronger than hollow stems.
If it were up to you, would you have high swirl at low lift, tapering off at higher lift, linearly increasing swirl with lift, or just steady high swirl throughout the lift curve?
Ah Eric, It's Madmax!
I have a set of 821 heads I need ro refresh for a Ls3/6L90E swap I am working on. In a 03'Crown Vic Police Interceptor. It's a project with my grandkids.
Have fun
Nothing like a rattle can rebuild to make your day
I think 575 to 600. Depending on the cam intake and carb used.
Watch out, 823 intake seats like to come out on their own.
So this is all static, which is good data. How does it change when you go to dynamic and actually have volume change, the time component, squish? Would the rpm for the swirl be affected a lot or does it really matter? Great vids!
I do think the piston plays a part but I can’t mimic that.
David Vizard & Stan Weiss list in/ex port lengths as 5.85"/3.12". Any idea why the discrepancy? Are yours approximate centerline length?
No I measured
Is there any differance between the 823 and 821 castings? Reason I ask, my motor has one of each on it
Internet gear heads say the 821 and 823 are the same castings. The difference in the 821 is 3 angle valve job and higher intake valves. 823 heavier intake and 2 cut valve job. Any clarification would be helpful.
Mine have all new ferra stainless valves in them and valve job, but yes I'd love to know more Info if anyone knows
Do you have any swirl numbers for either the 862/706 or 799/243 heads? Thank you
Yes
@WeingartnerRacing will you release this information?
Which Texas Speed Cam? The "Dumpster Fire" Cam is "allegedly" pretty rowdy.
I have the cam card, but I can’t remember
It might make 600hp not sure exactly torque maybe 550 because of that huge stroke
You can easily make as much actual hp as all the sbc guys used to say their engine made with dual exhaust and flipped air cleaner lid.
Lol
823's came with 2 different combustion chamber sizes
I've never heard of a head casting having alternate dimensions while using the same part number
@6.liter-beater its stjll wrong. 823s are LS3 rectangle ports. There is no shch thing as an 823 cathedral Port. Perhaps youre confusing the. Witb 8-FIFTY-3 heads
i clicked on this video because it IS an ls head
597hp..
Speaking of the seats, I'm an Australian, but I see Matt at MBE uses that stuff he swears by.
I never see anyone talking about risk mitigation using that awful metal that they use.
I personally wouldn't risk it, hell you don't port iron heads and I assume because you were getting elevated iron levels, might want to check into your alloy levels budy, look after your self.
Actually let's try 615hp and 575 ft lbs.
Calculating CSA is overrated, the radius in the port makes it difficult to accurately measure the length anyway, because you have to translate the curve to a straight line to get the true length. Appreciate the air speed measurements.
Thanks