camaroracer91

iTrader: (5)

would switching my heads to ls2 heads make any more power over the ls1 heads on a bolt on camaro with possibly a cam in the future?

Unertl42

iTrader: (63)

stock, or were you going to mill them down?

camaroracer91

iTrader: (5)

depends on what people are selling, would stock ones make a difference

GTOFan350

I've been wondering this myself. My friend just totaled his C5 Vette and I was wondering if his heads and cam would fit my ls1?

spray_goat

a stock 243 casting would pick up a few ponies, getting them milled down to 59cc would make a little more but it will limit your cam choices due to ptv issues

SOMbitch

iTrader: (8)

About 15rwhp is the number I see tossed about for a a stock valved no mill 243 casting.

Sales2@Texas-speed

iTrader: (5)

That's about right for a stock 243 or 799 casting head. Cam selection will dictate whether or not you should mill the heads, and if so how much to mill.

Bad G04t

I'm planning on putting stock ls6 243 heads on my 04 ls1 gto
I have them down at the machine shop now and they are going to deck them for straightness anyway and i was planning on running cometic .051 gaskets, how much can i get them milled safely for a mild build (LPE gt2-3 cam) without getting into valve clearance issues, I don't want a crazy compression ratio, just a little bump in power since I'm using unported stock heads

would milling just .010 or .005 be worth it? will this effect my pushrod length?