Upgrading heads for 408?
Upgrading heads for 408? I want to upgrade my afr205's in my 408 like now,I am taking them off this weekend.Which heads would best suit my application?Have money in hand to buy new heads ET'S,AFR225............
Teching In
Joined: Jun 2006
Posts: 6
Likes: 0
Save Money Hey check it out your AFR heads you have are veary and I mean veary respectable heads.In my opinion save your money and just have somebody respectable port them out.You said that you had your 408 build by LME just take those AFR heads back to them and have them port them out.I know the owner from LME I used to work with him Pacos the guy is guiness and know's what he is doing.If you did not do it when you got you'r 408 build have them put 2.08 Intake and 1.600 ex.depending on what cam you have that will be your best bet for more horse power.I'm actualy a head porter well used to be I worked at a respectable shop and know what I'm talking about know I'm in the Army and on my way to Iraq.Get back with and let me know you cam specs I got tons of more advice for you.
Well I guess I am going to AFR225 my friend is selling them to me brand new,anybody else have any suggestions or how to make them better.I plan to mill them .024 to get 62cc so I can be right at 11.60CR with a GM MLS gasket.Ill se if I can hit that 500rwhp mark
Trending Topics
I was looking into a set of ET 225's for my 346 (I will swap them to a 408 build next summer). I was talking to a member on here who has the ET 245s and said they are amazing on his 408. However, a 90/90 intake setup will not flow enough for those heads, he's going to use a sheetmetal intake of some kind. I would also look into a set of 1 7/8ths headers if you haven't already.
However, if you want to save the money you could probably get the AFR 205s you have now CNC'd and get some great flow numbers from them.
However, if you want to save the money you could probably get the AFR 205s you have now CNC'd and get some great flow numbers from them.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Well I already got the AFR 225's heads today,brand new.Next weekend Im going to go to Houston to pick up another 408 Brian at LME build for me.I told him about the heads,so we came to reason were going to mill them .018" while Im there, and go with a thinner head gasket to get .040" quench.I hear alot about quench as tight as .030" is that to close?I want to expect or assume to pick up at least 10-15hp
"All Motor 9 Second club member"
iTrader: (60)
Joined: Nov 2001
Posts: 3,235
Likes: 2
From: On the Bumper!
The 5.3s do well if ported right. Here's a thread from our SS.
https://ls1tech.com/forums/dynamometer-results-comparisons/521967-finally-got-408-grocery-getter-dyno-results.html
The AFRs would be a good choice though. Remember though that with a bigger cam you can run a bit more compression on pump gas. Just get the DRC right. Good luck.
Man you need things to go your way. You deserve a break. Keep us posteed!
https://ls1tech.com/forums/dynamometer-results-comparisons/521967-finally-got-408-grocery-getter-dyno-results.html
The AFRs would be a good choice though. Remember though that with a bigger cam you can run a bit more compression on pump gas. Just get the DRC right. Good luck.
Man you need things to go your way. You deserve a break. Keep us posteed!
SVT is right about ET 245`s. Mine outflow my 90/90 ported set-up bigtime. I`m saving to go alittle bigger to help them flow. But I wouldn`t change a thing!! Love the TRQ all threw my rpm range.
Originally Posted by marine02ss
Well I already got the AFR 225's heads today,brand new.Next weekend Im going to go to Houston to pick up another 408 Brian at LME build for me.I told him about the heads,so we came to reason were going to mill them .018" while Im there, and go with a thinner head gasket to get .040" quench.I hear alot about quench as tight as .030" is that to close?I want to expect or assume to pick up at least 10-15hp
What CR did u end up with, do you know your quench?I plan to run at least 11.7CR with .030 to .035 quench like the mamofied 383.I want to hit my goal of 500rw thats it then,Ill be happy and throw the 200 shot of gas
