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5.7 heads on 5.3 block ?'s

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Old 04-20-2012, 11:32 AM
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Default 5.7 heads on 5.3 block ?'s
I have an 08 5.3 aluminum block with top pistons, and I have found a set of 2000 5.7 aluminum LS 1 heads for good price. Will they fit and would they be good for boost.
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Old 04-20-2012, 01:44 PM
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They will fit and be ok for boost
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Old 04-20-2012, 01:58 PM
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Thanks
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Old 04-20-2012, 03:05 PM
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why not run stock 5.3 heads?
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Old 04-20-2012, 07:25 PM
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Your heads are better than the ls1 heads, you have the 799's you might actually lose power if you changed to those heads.
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Old 04-20-2012, 08:11 PM
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I don't have the heads that came with the motor. Just trying to find some heads to complete it. So I can boost it. Thanks for all the info.
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Old 04-21-2012, 01:04 AM
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What about ls6 heads, are the 799 better then them?
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Old 04-21-2012, 03:42 PM
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AAlso wondering the same thing on ls6 heads
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Old 04-21-2012, 08:34 PM
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If I was to get the 799 heads or the 243 could I still run pump gas with boost and not have detenation problems?
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Old 04-21-2012, 10:22 PM
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Yes^^^ but which eould.be better is what im curiious on. I have a motor at the shop.now and have 3my sets if heads and plannned on high compression with 243sthe and e85....
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Old 04-22-2012, 01:44 PM
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Im pretty sure the 243 and the 799 are the same heads just different casting numbers, I might be wrong though
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Old 04-22-2012, 06:51 PM
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The 243 and the 799 are the same casting head, the deference is that Ls6 243's came out with sodium filled valves.

Tim.
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Old 04-23-2012, 12:41 AM
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241 heads will give u about .5 lower difference in compression vs the 243 or 799 and if u go 243 or 799 the ls6 243 heads were the best like off the zoo vettes
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Old 04-23-2012, 07:00 AM
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Ok thanks.
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Old 04-23-2012, 06:17 PM
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How much compression are you guys running on these 5.3's when u boost them? Reason asking is that if I go with the stock head on my motor I will running 9.9:1.
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