C0lt45

I got a chance to buy a set of 6.0 heads for my ls1. What kind of power gains would i get with these heads if any at all?

codysgto

15hp untouched 30hp ported. Just my guess.

breze84

I agree with Codygto... Probably around 15-18hp untouched..... How much are you picking them up for???? For the money they usually go for your better off getting say patriots stage 3's.... For 1200 bucks... Those you would gain about 35whp with. Better bang for buck in my oppinion.

StealthFormula

iTrader: (35)

BTW The LS2 heads are 243 castings which are the same as the LS6 heads just without the hollow valves.

I have heard they are good for a solid 15rwhp or so as is and they have plenty of potential when ported.

For the right price ($400-500 max) I think they are an excellent upgrade.

6th gear

You get about 20 out of them.If you port the runners and polish them up you can get a lil more.How much are you getting them for?

LS12Fast4U

iTrader: (1)

Anything over 500 bucks and i would just save a little more and get the stage 2.5 5.3L heads from TSP.

batboy

iTrader: (6)

A guy posted on LS1GTO a while back that he got 20 HP by just swapping on the 243 heads.

LS12Fast4U

iTrader: (1)

Did he dyno that or was that what it felt like he gained?

SIC GTO

on a dyno

batboy

iTrader: (6)

It was on a dyno, if I thought about it, I might be able to come up with his name.

NateZQ8

iTrader: (3)

I wouldn't get the Stage 3's as they are only for 4.00 bores or larger. The stage 2's are a perfect fit for your LS1. I love mine!

NA$TY-TA

iTrader: (21)

Those are my thoughts too.

Most sell there 243's for $450-500.

Thats what mine will be up for sale for it a bit...

slammin86

iTrader: (4)

You also have to ask what mods you already have. If you bolt them on a bone stock 04 you may gain 15 hp, but if you bolt them on a 04 with cam and headers you might gain 25. It is all relative.

CABRO

iTrader: (1)

i got 21hp and 30 tq

schufflerbot

what mods were already in place when you switched them out?

i have the torquer V2 cam, LTs and PRC springs, retainers, blahblahblah...

im looking for a nice set of 243's too (shhhh... dont tell the woman) and was wondering what kind of gains people are seeing with a similar setup.

NABeastRR

id guess 20ish like every1 else has said.