sTOCK HEADS MILLED??COMPRESSION??
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From: Euless-Grapevine TX
sTOCK HEADS MILLED??COMPRESSION?? If I had my stock heads milled 30 thousands, what would my compression be??
also if you put 3.905 forged pistons what is your dis with stock heads??
also if you put 3.905 forged pistons what is your dis with stock heads??
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Originally Posted by NickcZ28
If I had my stock heads milled 30 thousands, what would my compression be??
also if you put 3.905 forged pistons what is your dis with stock heads??
also if you put 3.905 forged pistons what is your dis with stock heads??
Actually, it depends on many factors such as cid, head cc's, etc.
Here is a calculator:
http://www.c5frc.com/calculators/Com...Calculator.htm
Just subtract 30 thousands from your gasket thickness to get an estimate...
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From: BFE
Head CC volume vs Compression Ratio:
______________________________________________
The below CR numbers are with the stock GM 5.7L displacement LS1 graphite head gaskets installed.
Installing the thicker 2003 GM MLS head gaskets will decrease your compression ratio by approx 0.1 - 0.2
72.27cc = 9.1 CR
71.71cc = 9.2 CR
71.05cc = 9.3 CR
70.59cc = 9.4 CR
70.03cc = 9.5 CR
69.74cc = 9.6 CR
68.91cc = 9.7 CR
68.35cc = 9.8 CR
67.79cc = 9.9 CR
67.23cc = 10.0 CR
66.67cc = 10.1 CR (stock LS1 head spec)
66.11cc = 10.2 CR
65.55cc = 10.3 CR
64.99cc = 10.4 CR
64.43cc = 10.5 CR (stock LS6 head spec)
63.87cc = 10.6 CR
63.31cc = 10.7 CR
62.75cc = 10.8 CR
62.19cc = 10.9 CR
61.63cc = 11.0 CR (61.67cc would be a micron less)
61.07cc = 11.1 CR
60.51cc = 11.2 CR
59.95cc = 11.3 CR
59.39cc = 11.4 CR
58.83cc = 11.5 CR
58.27cc = 11.6 CR
______________________________________________
The below CR numbers are with the stock GM 5.7L displacement LS1 graphite head gaskets installed.
Installing the thicker 2003 GM MLS head gaskets will decrease your compression ratio by approx 0.1 - 0.2
72.27cc = 9.1 CR
71.71cc = 9.2 CR
71.05cc = 9.3 CR
70.59cc = 9.4 CR
70.03cc = 9.5 CR
69.74cc = 9.6 CR
68.91cc = 9.7 CR
68.35cc = 9.8 CR
67.79cc = 9.9 CR
67.23cc = 10.0 CR
66.67cc = 10.1 CR (stock LS1 head spec)
66.11cc = 10.2 CR
65.55cc = 10.3 CR
64.99cc = 10.4 CR
64.43cc = 10.5 CR (stock LS6 head spec)
63.87cc = 10.6 CR
63.31cc = 10.7 CR
62.75cc = 10.8 CR
62.19cc = 10.9 CR
61.63cc = 11.0 CR (61.67cc would be a micron less)
61.07cc = 11.1 CR
60.51cc = 11.2 CR
59.95cc = 11.3 CR
59.39cc = 11.4 CR
58.83cc = 11.5 CR
58.27cc = 11.6 CR
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Originally Posted by PREDATOR-Z
Head CC volume vs Compression Ratio:
______________________________________________
The below CR numbers are with the stock GM 5.7L displacement LS1 graphite head gaskets installed.
Installing the thicker 2003 GM MLS head gaskets will decrease your compression ratio by approx 0.1 - 0.2
72.27cc = 9.1 CR
71.71cc = 9.2 CR
71.05cc = 9.3 CR
70.59cc = 9.4 CR
70.03cc = 9.5 CR
69.74cc = 9.6 CR
68.91cc = 9.7 CR
68.35cc = 9.8 CR
67.79cc = 9.9 CR
67.23cc = 10.0 CR
66.67cc = 10.1 CR (stock LS1 head spec)
66.11cc = 10.2 CR
65.55cc = 10.3 CR
64.99cc = 10.4 CR
64.43cc = 10.5 CR (stock LS6 head spec)
63.87cc = 10.6 CR
63.31cc = 10.7 CR
62.75cc = 10.8 CR
62.19cc = 10.9 CR
61.63cc = 11.0 CR (61.67cc would be a micron less)
61.07cc = 11.1 CR
60.51cc = 11.2 CR
59.95cc = 11.3 CR
59.39cc = 11.4 CR
58.83cc = 11.5 CR
58.27cc = 11.6 CR
______________________________________________
The below CR numbers are with the stock GM 5.7L displacement LS1 graphite head gaskets installed.
Installing the thicker 2003 GM MLS head gaskets will decrease your compression ratio by approx 0.1 - 0.2
72.27cc = 9.1 CR
71.71cc = 9.2 CR
71.05cc = 9.3 CR
70.59cc = 9.4 CR
70.03cc = 9.5 CR
69.74cc = 9.6 CR
68.91cc = 9.7 CR
68.35cc = 9.8 CR
67.79cc = 9.9 CR
67.23cc = 10.0 CR
66.67cc = 10.1 CR (stock LS1 head spec)
66.11cc = 10.2 CR
65.55cc = 10.3 CR
64.99cc = 10.4 CR
64.43cc = 10.5 CR (stock LS6 head spec)
63.87cc = 10.6 CR
63.31cc = 10.7 CR
62.75cc = 10.8 CR
62.19cc = 10.9 CR
61.63cc = 11.0 CR (61.67cc would be a micron less)
61.07cc = 11.1 CR
60.51cc = 11.2 CR
59.95cc = 11.3 CR
59.39cc = 11.4 CR
58.83cc = 11.5 CR
58.27cc = 11.6 CR
Try using that calc that was posted. See if you can get the numbers to work out. I'm just trying to clear up if this calc should actually be used by anyone, and why the numbers differ.
