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How much compression Change???

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Old May 19, 2005 | 09:33 PM
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Default How much compression Change???

Just got some used Stage 2 heads that are milled .030 About how much will that increase the compression ratio? Thanks.
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Old May 20, 2005 | 12:43 AM
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what castings?
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Old May 20, 2005 | 08:50 AM
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They are 853 castings
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Old May 20, 2005 | 09:02 AM
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What gasket? Graphite, MLS or Cometic?
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
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Old May 20, 2005 | 09:29 AM
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I have not yet installed the heads and don't know the thickness of the three gaskets you mention. If the .030 mill raises the compression to much, I would probably opt for the thickest gasket. Thanks
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Old May 20, 2005 | 10:34 AM
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If you keep the same gasket, .030" mill will raise the compression between 10.9-11.0:1. Using the GM MLS gasket will lower the compression .1-.2 points.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.

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Old May 20, 2005 | 11:11 AM
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Thanks for the info. Is there some data on the thickness of the different head gaskets available for the LS1?
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Old May 20, 2005 | 11:39 AM
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Originally Posted by BadgeZ28
Thanks for the info. Is there some data on the thickness of the different head gaskets available for the LS1?
Yes, click here: https://ls1tech.com/forums/advanced-engineering-tech/111207-ls1-head-combustion-chamber-cc-volume-vs-cr.html
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