Ls4GXP

Why wouldn't the L92 heads work in replacing our Ls6 heads? The GTO guys are replacing there Ls6 heads with the L92s, naturally they should just bolt in........no?

neilownz

i think the intake runners might be different and we are kinda stuck with what we got for intake manifold.

Brian396

iTrader: (3)

Cylinder bore is too small on the ls4. And yea that intake.

07MCSS

iTrader: (3)

Our cars use the same 243 heads that were available on the LS6 and LS2 engines sans the hollow valves and stronger springs.

Ls4GXP

So the L92s will easly bolt on in place but not give you any hp over the Ls6 because of the intake runners??

tokay57

those heads are way to big for 325 cubic inches unless you want a pretty serious street/strip car, for which our cars does not have a stout platform for. you will need a minimum bore of 4 inches which the ls2 block has.

1BADCTS

iTrader: (17)

Negative. The L92 heads require a minimum 4" cylinder bore diameter. Our LS4's only have 3.78". I'm not familiar enough with our motors yet to know if we could bore the LS4 to 4" or not.. but I doubt it! 0.22" is a lot of meat!

neilownz

it would require resleeving or not using sleeves