LQ9 & PRC 5.3l heads. Whats my compression?
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I'm getting ready to put my motor together, but I want to make sure I'll be good on 91 octane cause we dont have 93 here in vegas. I picked up a set of PRC stg 2.5 5.3L heads for my LQ9 and now am worried my comp may be a bit high. The cam specs I will be using is 224/230 .610 .605 11+2. I've read anywhere from 10.9:1 to about 12:1. I was planning on using Factory GM 5-layer MLS head gasket, 051 in. Compressed Thickness, 4.080" bore.
What will my compression be?
Will this gasket work or should I use something else?
*****Edit****** I just found out that they are 61cc
What will my compression be?
Will this gasket work or should I use something else?
*****Edit****** I just found out that they are 61cc
Last edited by Hawaiian_Built; 10-03-2011 at 04:04 PM.
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Ls2 compression is 10.9:1 with a 65cc ls6 head so if you take a cc or 2 off that you are probably looking at a touch over 11:1. for 91 octane that is getting up there but you should be fine if you dont throw a ton of timing at it. Im sure there are plenty of TBSS's running around on 91 octane.