L92 heads

Reply Subscribe

Thread Tools

Search this Thread

Dec 30, 2008 | 02:28 PM

Ls4GXP

Thread Starter

On The Tree

Joined: Aug 2007

Posts: 190

Likes: 0

From: Oregon

L92 heads

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?

Dec 30, 2008 | 02:55 PM

neilownz

TECH Fanatic

Joined: May 2008

Posts: 1,769

Likes: 0

From: Fargo, ND

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

Dec 30, 2008 | 07:46 PM

Brian396

TECH Enthusiast

iTrader: (3)

Joined: Aug 2007

Posts: 749

Likes: 0

From: Ottawa IL

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

Dec 31, 2008 | 07:36 PM

07MCSS

On The Tree

iTrader: (3)

Joined: Mar 2007

Posts: 187

Likes: 0

From: Little Rock, AR

Quote:

Originally Posted by neilownz

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

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

Jan 1, 2009 | 10:50 AM

Ls4GXP

Thread Starter

On The Tree

Joined: Aug 2007

Posts: 190

Likes: 0

From: Oregon

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

Jan 1, 2009 | 11:16 AM

tokay57

On The Tree

Joined: Aug 2007

Posts: 121

Likes: 0

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.

Jan 1, 2009 | 11:16 AM

1BADCTS

TECH Resident

iTrader: (17)

Joined: Jun 2006

Posts: 887

Likes: 14

From: Tyler, TX

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!