rst06rado

I just picked up a set of untouched LS6 heads and was wondering who was running them on there trucks, and if they had them milled at all? Thanks.

Truckshop

iTrader: (17)

you have to mill them to keep compression at stock levels. they are a good upgrade for what they cost. i would send them to someone to have them ported to really get some bang for your buck.

dirt track racer 81

iTrader: (45)

i have a set on my 370. i milled them .030 for a cr around 11.4:1

rst06rado

Thanks Truckshop and Dirt Track Racer 81. Anyone else?

nighthawk08

what engine are you putting them on?

rst06rado

5.3 with the gm hot cam.

00ChevyScott

iTrader: (10)

I'd say to use 5.3 heads and get them worked over so you can run a higher compression.

rst06rado

Well what I had in mind was to use these LS6 heads. (which I imagine flow better than my stock?) Then have the milled to bump my compression. Am I going in the wrong direction? Anybody running 243's on there 5.3?

nighthawk08

you have to mill quite a bit to actually bump your compression on a 5.3. you actually have to mill them just to get to stock compression. they're good heads for a 6.0 though.

RandomHero

iTrader: (24)

I remember sport side swapped to some milled 243s with his 5.3L and 220 split duration cam and didn't gain hardly anything.