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Nov 3, 2013 | 11:41 PM

#1

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From: texas

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I have a lm7 5.3L bored to Ls1 spec's...can I still use 5.3L internal parts in the now ls1 5.7L?

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Nov 5, 2013 | 01:51 AM

#2

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From: Chillicothe/Lima, Ohio

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After everything is rebalanced. Yes

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Nov 5, 2013 | 08:24 AM

#3

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From: Elizabeth City NC

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Pistons are no longer the same.

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Nov 6, 2013 | 11:46 AM

#4

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From: texas

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so I can all 5.3 internal parts except the pistons which have to be 5.7L ?

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Nov 8, 2013 | 12:51 AM

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The pistons have to match the bore, you will be able to use the rods and crank from the 5.3 but the pistons are larger for a 5.7.

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Nov 11, 2013 | 07:21 AM

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You guys probably will fry me for not looking his answer up but I'm not savvy to this site. I have a 04 5.3 with .588 cam around 114 lobe sep. with I believe 228 duration. I want to put these 806 heads that have been ported and 2.02 intake valves on the 5.3. Anyway to trick some compression back with a gasket instead of milling heads. I guess the heads are 66cc?

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