compression LS1 5.3
#1
compression LS1 5.3
Just bought a complete 1998 LS1 short block with 23k on it, been in storage. What would the compression be with mt stock 5.3 862 heads? The motor is a short block no heads. I am going to replace the short block with all my parts and see how it runs.
#5
Found this on Tech:
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
61.07cc = 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
https://ls1tech.com/forums/advanced-...ume-vs-cr.html
Dam that would be a 11.1 5.7 with stock 5.3 heads. Is that too high?
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
61.07cc = 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
https://ls1tech.com/forums/advanced-...ume-vs-cr.html
Dam that would be a 11.1 5.7 with stock 5.3 heads. Is that too high?
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