say if i was to go with a stock l92 heads on my 408ci (-22cc pistons and ls9 gaskets) what kinda boost could i run before they start trying to lift?
i have 317's not and i was told you can't run the boost on the l92 that you can with a 317's because of the l92 deck being thinner than the already thin 317's??

i would like to make as much power as possible but not pushing water every time...lol

 

My cousin is doing 14psi with a Maggie and a 100 shot with those heads. We plan on doing 15-20 with a TT setup but I might go with LS9 heads as they are made of a better material.

 

the main thing is... are the l92's as-cast heads worth the money or should i stick with my 317's untill i can afford a head such as the trick-flo 235cc?

 

My cousins are as cast with just some dual springs and he runs consistent 10.3's. We are hoping to do better so a P&P is on order although not absolutely necessary since you are shoving the air in under pressure.

My shop just wanted to do a pocket port and call it a day but I figured I might as well get them Stage 2. The intake side flows good but the exhaust side leaves a lot on the table.

 

stock48 went 9.6 on 317s if that means anything to ya

 

Are the L92's indeede thiner? Has anyone actually measured one? I saw one down at the stealership the other day, and it looked to be similar thickness to the 317.... Yes I wen't mid 9's with 317's but they flow withen 3 cfm of the trick flow 220's I have sitting here... I doubt you will come anywhere close to the same power per lb of boost with a stock unported 317. The L92's, on that 408, 91mm will make way more power at lower boost than the stock 317's, and probably even ported 317's...

 

J,
you cost me TOO much money
but thanks for ALWAYS helpin

 

Stock48
i just bought a set of l92's want me to send them to you for some messaging?

 

might be a stupid question but what kind of CR would L92 heads yield on an LQ4?

 

Not really much of a change over stock, depending on gaskets used. The combustion chambers are very close in cc’s stock for stock at basically 70cc vs 71cc.