I was wondering if you guys could tell a big difference when you installed your heads? What is everyones opinion on the afrs that tpis sells that supposedly are further ported? Is it worth the extra 100 dollars? They want 1800.00 And I think the same heads without the porting , straight from afr are 1700.00. Im hoping for about 40hp. Is that possible with my setup? Thanks

 

the castings from AFR are rough, in that they still have machining marks from the CNC work. They probably just smooth out the ports. I had four bad guide plates, and I'm gonna have to grind the heads a bit to get the valve covers to sit flat. I'm a little pissed at the quality of the heads.

 

On my Imp I went from pocked ported iron heads and a ZZ3 cam with 3.73's and a Super Yank 3500 to a LT4 Hotcam and 190cc AFR's with a porting job flowing 280 cfm's (intake) with everything else being the same I only gained 2 tenths in the 1/4. I was pissed. I am not very happy with them and when I installed them they weighed about the same as my iron heads. For the money I spent i'm not impressed.
HVY SS

 

How about everybody else? So far it looks like nobody is happy with the AFRs. They should definetly give you more than .2ths when the darn things cost $1700. Are these heads not worth it? Anybody have TPIS's fully ported stock castings , with bigger valves? Are these going to be almost as much power as the AFRs? I really want some good flowing heads. Can someone help me? Thanks

 

ttt

 

If it were me I would either port youe LT1's on buy the LT4's. You can get the LT4's for about 660.00 each with 2.00/1.55 sodium filled valves and are good combo for the LT4 Hotcam. I wish now I would have gotten the LT4's. Good luck.
HVY SS

 

If your going to lay out the money for AFR's why not get these LPE

 

Why buy those? Just because they are from Lingenfelter, doesn't prove they're any better. Best bet would be to go with Advanced Induction(Phil Odom's stuff). They've proven to make over 400rwhp with his custom cam.

 

Hmmm...lets see....nine time NHRA champ with mega dollar CNC machine or a guy doing porting on the side....

 

I am sure they are good heads...but with out flow numbers to prove it, they be no better than your stock heads.

The proof is in the pudding as they say and with Lingenfelter you are paying for a lot of name and not necessarily any better product.

 

I'm not trying to be an a$$, but did they win those nine NHRA championships with the LT1 heads they sell to us? I'm betting they didn't. Have you heard or seen anyone on this board make 400rwhp with the Lingenfelter heads? I haven't (that doesn't mean they won't, but I haven't heard of it). However there are several people making over 400rwhp with Phil's heads. Wouldn't you rather use a setup that is known to make power, or would you rather just trust in a name?

 

That is a pretty silly statement. Lingenfelters 383 cars trap 115 with a TINY cam and 50-state emissions legal certified! Sounds like the proof IS in the pudding...


I also noticed a fast Impy about a year ago in GMHTP that gained 80 horse (!) with Lingenfelter LT4 heads over some not-to-shabby AFR 195's.

Flow bench numbers are but one piece of the pie. How about velocity? Swirl? To sit there and obsess over flow numbers is to miss a big part of the equation IMO....

 

I am not obsessed with numbers..but like Big Daddy said... I haven't seen to many LPE headed cars to start with and the ones I have haven't been that impressive.

 

Gotta agree. I have a friend with a similar setup to the one I had previously: 383 with SC, similar cam. He is using $2,500 Lingenfelter heads and mine used out of the box (unported) AFR's. However, he has a bigger blower (T-trim v. S-trim), one point higher CR, and a better exhaust (long tubes and no cats). My car made ~30rwhp more than his. This difference is probably due to my M6 vs. his automatic, so I call them equal. But the point is that those heads have to be worse than mine. He ought to make more hp.

Rich Krause

 

Flow numbers and dyno numbers mean d*** (both can be inflated), the only real measure are track times. If my car would run low 11's at 120+ with only 320 rwhp who cares? What woud you rather have a dyno monster or a fast car?