mrfrostberry

iTrader: (10)

well, i spun a bearing and have to rebuild my motor. i had a 5.3 laying around and decided to take the heads and crank. basically, i need to know what kind of compression i'm looking at. here's what i have:

stock crank
stock rods
mahle +4cc 3.908 pistons http://store.summitracing.com/partde...4&autoview=sku
stock 5.3 heads

lemme know if i need to include anything else. thanks for any help, guys.

JPH

iTrader: (2)

10.5 range. Need more info? What head gaskets?

mrfrostberry

iTrader: (10)

i'll be using gmpp replacement gaskets. forgot to mention that. how did you figure compression? by the way i believe the heads are around 61 cc.

JPH

iTrader: (2)

10.53 i pretty sure.

mrfrostberry

iTrader: (10)

really? that seems a little low. i thought they 5.3 heads would raise compression up about 1 point to right around around 11:1?

405HP_Z06

iTrader: (11)

The 4 cc valve reliefs are offsetting the reduction in combustion chamber volume.

mrfrostberry

iTrader: (10)

ah i see new. thanks.

Dragkid1917

iTrader: (2)

The gaskets definatly have alot to do with it. The difference between a .030 gasket and the stock .052 (or .054 or something) will change the number by a decent amount. Im sure you already know this but i know that putting .030's on my ls1 raised compression up to right around 11:1 with just that swap, so playing with a variety of gaskets will yeild your desired compression ratio.

mrfrostberry

iTrader: (10)

so how thick of a head gasket would i need to get around 11:1 with my set up?

DONAIMIAN

iTrader: (18)

Mill the heads to 59cc and you'll be just over 11.0.