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Compression ratio?? Need advice please

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Old Aug 6, 2009 | 10:25 PM
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Default Compression ratio?? Need advice please
I have a stock Ls1 346ci engine and Im planning to get texas speed PRC LS6 stg 2.5 CNC ported cylinder Heads. After adding these heads, what will the COMPRESSION RATIO in the motor be?? This will help Me pick a specific camshaft for the heads, any help please, thank you
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Old Aug 6, 2009 | 11:35 PM
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im intrested in this myself...how much affect does valve relief have on it?
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Old Aug 6, 2009 | 11:39 PM
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Depends on how much the deck is milled and I think that's a costumer choice and what gaskets you end up using?
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Old Aug 6, 2009 | 11:50 PM
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PRC LS6 stg 2.5 CNC ported heads are 64cc
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Old Aug 7, 2009 | 09:39 AM
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Fairly certain it will be ~10.5:1
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Old Aug 7, 2009 | 01:16 PM
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Call texas speed and ask them they build the heads.
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Old Aug 7, 2009 | 02:47 PM
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With the stock short-block and GM MLS head gaskets you can get them at 64cc chambers and that will net you about 10.7:1. Of course thinner gaskets and milling can bump your compression up from there!

What camshaft were you considering?
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Old Aug 8, 2009 | 12:24 AM
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With those PRC LS6 stg 2.5 CNC heads? The Torquest camshaft from the following is what I will use:

215/231 .631/644-118lsa
232/234 .646/.612-112
235/243 .621/.624-113
239/242 .649/.609-112

Which one is the Torquest camshaft for those heads??
Thanks
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Old Aug 8, 2009 | 12:52 AM
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Originally Posted by sspower23
With those PRC LS6 stg 2.5 CNC heads? The Torquest camshaft from the following is what I will use:

215/231 .631/644-118lsa
232/234 .646/.612-112
235/243 .621/.624-113
239/242 .649/.609-112

Which one is the Torquest camshaft for those heads??
Thanks
Why limit it to those choices - especially the first one? Your first selection is similar in profile to the CheaTR, a compromise cam for stock like sound with a stock exhaust. All the rest tend toward the mid-upper range.

You've really skipped over the lower 220's cams that will really make some torque at useable rpms.
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