Snafu

iTrader: (1)

Here's the situation...

I'm going to do an ls1 to ls6 conversion on my 04' GTO. Someone has offered me takeoff heads (complete) from an 04 Z06...for about a $100 less, I can buy LS6 heads from gmpartsdirect brand new but they are listed as 02-03 heads.

I realize the LS6 remained mostly unevolved since 02' but was unsure if the 04' Z06 got any better parts seeing as the C6 production was started on the assembly line and the Z06 got some of it's parts (primarily fuel system). Other than possibly the LS2 timing chain, I wouldn't think there'd be any differences especially since the LS2 uses modified LS6 heads. Anyone know for sure?

Just want to make sure that the assembled heads (gm part# 12564824) are my better choice before I turn down the other offer.

Thanks guys.

Snafu

iTrader: (1)

24 views and no answers....can anyone help me out?

PREDATOR-Z

Head to head swap?? For that money 1300$ you would be better off sending your heads for a nice stage 1.5 porting job with a little mill.
All you get from LS6 is 20cfm at .600 and .5 increament in CR.

Lift----stock LS1---stock LS6
-------int/exh------int/exh--
.200---136/108----137/116
.300---196/145----188/153
.400---217/170----233/175
.500---224/186----260/193
.550---227/192----245/227
.600---230/198----245/200
.650---233/200----245/202

this just an example on a 4.125 bore at 28inch water.

goober35

iTrader: (1)

The heads off of a 02-04 ls6 (243) are all the same. If you are just going to swap the heads i would say it is kinda worth it but not to much. You would be better of with a set of Ported heads. But you could get a set of ls6 heads from one of the sponcers like TEA or GTP and send them your ls6 heads as cores. I am guessing that the write up is old.
In stead of doing an LS6 cam y not do something a little larger. Not to much bigger is you dont want to but it would be nice. I bet a nice 224/228 on a 114lsa cam would do realy nicely. Not to much lope nice drabilaty and more power as tim allen would say. You would spend a little more but not much. What does the ls6 cam cost same with the springs. I know you could get 918's springs and the cam for $560. I think you would be happeyer.

Snafu

iTrader: (1)

Thanks guys...but I just realized that the gmpartsdirect price is PER head (oops). So obviously, my better choice (cost-wise) is the takeoffs.

Main reason for wanting to use LS6 parts is that I can get them for a reasonable price (under $1k for complete heads, cam, and exhaust manifolds...yes I know, need headers, but cost prohibits right now and those manifolds are bigger than a GTO's stockers).

I may port the LS6 or my LS1 heads out in the future (or buy and send as core), and I may go to a slightly more aggressive cam like a 221/221, .56", 114LSA (I realize the 117LSA on the LS6 cam is a bit on the high side). But for now, I'm just playing around and don't mind doing another swap in the future if need be. And to be honest, bang for the buck, I don't think I can do much better (unless someone sells me a used cam).

goober35

iTrader: (1)

I dont think the ls6 manifold will line up with the GTO exhaust. Your stock manifold have the same bolt pattern and they will bolt up to the heads so no need to getor rig the ls6 manifolds to the GTO. I dont think the ls6 manifold are even at the proper angle to line up. But i have not done much work on a GTO yet mostly F-Bodys and Vettes.

Richiec77

iTrader: (3)

Is this cam already used? I for one IMHO don't like to chance my money or engine on a used cam. You can get new z06 cams for around $200. The only way I get a used cam is from a great source that only used it for cam testing or something similar.

Snafu

iTrader: (1)

Well, I'm pretty sure the LS6 manifolds will line-up seeing as they are similar to LS1 manifolds...guess there's one way to find out...for $40 it's no great loss if it doesn't work...maybe LS2's which are supposedly 1/3 larger would if this doesn't (but they have a very different angle) as LS2 heads are basically LS6's.

Yes, the cam I'm considering buying (pending inspection) is slightly used...takeoff of an 04 Z06 with about 5k miles on it. If it show anywhere I'll spend the extra $100 and get a new one.

CMcCarthy

I think he's saying the manifold's exit won't line up with the h-pipe, not that the ports won't line up with the heads.

Snafu

iTrader: (1)

I checked it out...by the looks of it, you guys are right. But the LS2 manifolds might work...hmm.