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5.3 cr

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Old 07-27-2010, 09:45 AM
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Default 5.3 cr

What is the CR for a stock 06 5.3 with 706 heads? Just wondering if I should change the heads out to lower the compression.Im going to put a turbo on it whille im waiting on my 6.0 to get built.
Old 07-27-2010, 09:53 AM
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9.5'ish... 61cc combustion chambers.
Old 07-27-2010, 11:15 AM
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I wonder if it would be worth the hassle to even change the heads
Old 07-27-2010, 07:42 PM
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Originally Posted by mudmanmatt
I wonder if it would be worth the hassle to even change the heads
Keep the boost under 10lbs and you'll be fine with the 9.5:1. I've been running 10lbs on a 10:1 LQ9 for 3+ years without an issue.

You'll need some 317's for your 6.0l if you don't already have a set.

Rick
Old 07-27-2010, 08:11 PM
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Old 07-27-2010, 09:49 PM
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I may put the 317on the 5.3 and get some aftermarket heads for the 6 oh. Do u know what the CR would be with the 317 Im thinking there 72cc?
Old 07-28-2010, 12:25 AM
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Originally Posted by mudmanmatt
I may put the 317on the 5.3 and get some aftermarket heads for the 6 oh. Do u know what the CR would be with the 317 Im thinking there 72cc?
The 317's are 71.06 cc and will drop the compression to about 8.5:1. It will be pretty sluggish off boost with that low of compression. Stick with your 706's and slap on the Turbo.

Rick
Old 07-28-2010, 12:53 AM
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i woudlnt worry to much bout switchin out heads on ur 5.3... hell my plan is to eventually run a 6.0 at 10:1 N/A and later with boost.. its all in tune bro... 317s on a 5.3= a TURD out of boost
Old 07-28-2010, 01:36 AM
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You don't wanna run the 317's on your 5.3.
Old 07-28-2010, 08:14 AM
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Thanks guys!
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