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CR question 6.0L

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Old 04-13-2017, 11:06 AM
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Default CR question 6.0L
If someone could tell me what CR I would end up with using this combination of parts I have, I would appreciate it. I have a 1999-2004 cast iron block #12551364 with slightly dished pistons marked #3683 and I have #317 heads. Thanks for any help you can offer.
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Old 04-13-2017, 12:40 PM
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Are those stock pistons? Or aftermarket? What's the head gasket thickness?
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Old 04-13-2017, 02:06 PM
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wretched73, the pistons are supposed to be stock. I bought the short block years ago and it was presented to me as a low mileage stock short block. Somewhere along the way I bought the #317 heads. I'm just a little confused about the CR because I thought 6.0L engines came with flat top pistons.
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Old 04-13-2017, 02:27 PM
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lq4 6.0=dished pistons
lq9 6.0=flat top
ls2 6.0=flat top

look up the stock CR of a lq4.
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Old 04-13-2017, 02:32 PM
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TXsilverado, Thank you sir.
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Old 04-13-2017, 02:56 PM
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should be around 9.5:1 if it is a stock Lq4 with stock thickness head gaskets. The flat top Lq9 is 10:1 and the flat top Ls2 is closer to 11:1......
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Old 04-13-2017, 03:27 PM
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chevy claims the LS2=10.9:1. none of my calculators agree but it's close enough.
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Old 04-13-2017, 03:33 PM
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53bowtie, I appreciate the help.
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