How to lower compression on stock ls1 ?
01-18-2006, 05:26 PM
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How to lower compression on stock ls1 ? I want to lower my compression a little because im going to boost,. I was told if you swap lq9 heads on it will lower it. Is there any other ways you can besides getting into the bottom end, maybe different head gaskets ???
01-19-2006, 10:47 AM
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6.0L heads from a GM truck will lower ur CR
2002 LQ9 Aluminum found on 2002+ 6.0L High Performance trucks will make the compression ratio about 9:1...this head is alsmost the same as a LS6 head with imporved intake and exhasut ports
2001+ LQ4 Aluminum found on 2001+ Low Performace tucks with 6.0L will also make compression ratio about 9:1
2002 LQ9 Aluminum found on 2002+ 6.0L High Performance trucks will make the compression ratio about 9:1...this head is alsmost the same as a LS6 head with imporved intake and exhasut ports
2001+ LQ4 Aluminum found on 2001+ Low Performace tucks with 6.0L will also make compression ratio about 9:1
01-19-2006, 11:45 AM
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thicker headgaskets is the worst way to lower compression IMO because of the effect on the squish/quench area.
I would consider unshrouding and polishing in the chamber before anything else.
I would consider unshrouding and polishing in the chamber before anything else.
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01-31-2006, 12:34 AM
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Originally Posted by white2001s10
thicker headgaskets is the worst way to lower compression IMO because of the effect on the squish/quench area.
I would consider unshrouding and polishing in the chamber before anything else.
I would consider unshrouding and polishing in the chamber before anything else.
I would buy the 6L heads, and have some headwork done to those. Run stock gaskets and call it a day. I was going to do exactly that but I'm going iron 370 real soon and a set of after market castings.
01-31-2006, 12:51 AM
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01-31-2006, 02:37 AM
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i dunno if you want to do it but since your lowering the CR i imagine you are going to be wanting to make some serious HP so might want to even consider a forged bottem end.
01-31-2006, 03:54 AM
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Limit on stock bottom end is about 10# of boost and you can make that with stock CR, intercooler, good tune and water/meth injection on 93 octane pump gas.
Post it in FI forum for more feedback.
Post it in FI forum for more feedback.
