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how much compression?

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Old Feb 11, 2009 | 08:55 PM
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Default how much compression?
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.
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Old Feb 11, 2009 | 09:07 PM
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Originally Posted by mrfrostberry
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.
10.5 range. Need more info? What head gaskets?
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Old Feb 11, 2009 | 09:18 PM
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Originally Posted by JPH
10.5 range. Need more info? What head gaskets?
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.
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Old Feb 11, 2009 | 09:33 PM
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Originally Posted by mrfrostberry
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.
10.53 i pretty sure.
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Old Feb 12, 2009 | 11:51 PM
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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?
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Old Feb 13, 2009 | 12:25 AM
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The 4 cc valve reliefs are offsetting the reduction in combustion chamber volume.
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Old Feb 13, 2009 | 09:34 AM
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Originally Posted by 405HP_Z06
The 4 cc valve reliefs are offsetting the reduction in combustion chamber volume.
ah i see new. thanks.
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Old Feb 13, 2009 | 09:51 AM
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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.
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Old Feb 13, 2009 | 05:10 PM
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so how thick of a head gasket would i need to get around 11:1 with my set up?
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Old Feb 13, 2009 | 09:46 PM
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Mill the heads to 59cc and you'll be just over 11.0.
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