. 
best LT1/LT4 heads
what sucks is the only way to compare them truly is buy a set, dyno and take it to the track , Then buy another set put on the same car and see what difference there is with changeing nothing else!
TECH Fanatic
Joined: Nov 2008
Posts: 1,776
Likes: 1
From: South Dakota
Only way to know would be to back-to-back them on an engine dyno, same day.
Same thing at the track. And, yes guys do that at the track.
Btw, flow benches vary so much, seeing a flow sheet means nothing at all.
Same thing at the track. And, yes guys do that at the track.
Btw, flow benches vary so much, seeing a flow sheet means nothing at all.
LMAO I checked last post date, which was recent, but never checked OP.
Exactly. My heads on the bench they were ported on flowed 330. I milled 5cc's off the chamber and had them flowed on my local bench, with a clay fixture and no pipes, and they did 315. No clue what lost/gained any CFM since I don't know the fixture type, material, or pipe length of the original bench used...I could have lost 15cfm from the mill and the benches were similar, only lost 5cfm from mill and new bench just reads 10cfm lower, or not lost anything and just had a stingy bench. Hell, the first bench could have been at 26" instead of 28" and my 315@28"=326 @ 26" so I only lost ~4cfm from the mill 
.
Flow numbers are only useful compared to the same physical bench, using the same test pressure.
.Flow numbers are only useful compared to the same physical bench, using the same test pressure.
Teching In
Joined: Nov 2002
Posts: 41
Likes: 0
From: Baton Rouge, La
BrandonB
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
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
Teching In
Joined: Aug 2022
Posts: 2
Likes: 1
FOR a mild build 400hp 500hp still a comfortable streetable car just have lloyed Elliot port your heads and intake with bigger valves and you got a fast car.. I know this is a 2006 post... Forums are dead😁
Teching In
Joined: Jan 2024
Posts: 44
Likes: 14
The problem with this argument is that the answer you get from guys is going to be based on whoever they shopped with. Most guys have not run both so their opinion is going to be biased one way or another. Also a lot of the answers in this post referenced heads that have had extensive work done by the induction specialist of their choice.
If you are going to get a guy to redo the whole port, put their valve job on it, suggest different springs/valves, etc....you might as well send them a pro port and let them do it from scratch with an AFR/Trick Flow casting.
If you are going to get a guy to redo the whole port, put their valve job on it, suggest different springs/valves, etc....you might as well send them a pro port and let them do it from scratch with an AFR/Trick Flow casting.
That would be great if their turn around time is realistic. It wasn't too long ago where they were ignoring phone calls and e-mails of those who were inquiring about LT1 stuff. I do believe someone here did get ahold of them and they said LT1 **** was the lowest of their priorities, at least at that specific time (a few years ago). Another shame is Craig with GTP, whose heads were very high caliber, but once he got too popular his customer service went to ****. I'd take his heads any day of the week even on a Friday over LE.
Last edited by SS RRR; Feb 4, 2024 at 04:31 PM.
Teching In
Joined: Jan 2024
Posts: 44
Likes: 14
Crazy it took all this time for the gen 2 to get a race block. Zero chance a lot of these shops and companies do a 180 and start doing LT1 stuff but it will be interesting to see how far some of these guys push the platform with more options. Its amazing that Grubbworm was able to go so fast with a stock block.