Z28Dave

iTrader: (10)

Alright so I listed the wrong heads at it was the PRC STG 2.5 5.3 heads not the LS6 heads. And I'll Be running it with a EnglandGreen Mayhem II cam.

what head gasket should I run? 5.3? 5.7?

Burken01

iTrader: (88)

What engine, if ls1 5.7 then get the 5.7 gaskets

WS6ICK2k

Depends on cubic inches

JakeFusion

iTrader: (7)

EnglandGreen Mayhem II cam

Specs?

Z28Dave

iTrader: (10)

I was told by them its a 24x/24x .635/.650 113LSA

Z28Dave

iTrader: (10)

its a 346 LS1

JakeFusion

iTrader: (7)

Cometic 3.910" bore gaskets or the stock LS1 MLS gaskets. Don't worry about the 5.3L chamber. You have to get a gasket that's bigger than whichever is bigger, either the combustion chamber or piston bore.

And that's a bigass cam. Will be a topend screamer.

RezinTexas

this.

Measure both, then specify your head gasket bore

Burken01

iTrader: (88)

Damn that's big, what's your valve train look like?

Stalled auto?

Z28Dave

iTrader: (10)

This is the first time i've ever done a big cam swap and decent heads, so how do i measure it? is it the circumference of the piston or from the Head? the extent of swapping was 317s on a stock ls1

for my valve train i have the PRC STG 2.5 5.3L heads with trunion upgrade and lunati gold springs for .660. its going through a T56 stock 10 bolt. i'm getting a M9 in june.

RezinTexas

1. Measure your cylinder bore. If you are stock LS1/6, then you are at 3.9XX
2. Measure width of combustion chamber. With 5.3 heads, I'm guessing this is around 3.8XX.

For example, my block is 3.905" bore, and my head combustion chambers are 3.96X. In that case, anything 4.000" and over is acceptable.

Z28Dave

iTrader: (10)

Ah ok thanks, another question somewhat related. When you get PnP heads from PRC do they remove the casting number and replace it with PRC or do they leave the casting number?

RezinTexas

no idea man, sorry.