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Generation III Internal Engine 1997-2006 LS1 | LS6
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5.7 heads on a 5.3?

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Old 10-22-2007, 05:13 PM
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Default 5.7 heads on a 5.3?
OK i listed my spare heads on Ebay, which are 853's, and a potential buyer wants to put them on his 5.3 truck. Will they fit?
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Old 10-22-2007, 05:58 PM
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Will they fit...Sure. Is it a wise choice...NO

Unless he is using them for forced induction, the larger chambers with drop the compression ratio on the 5.3.

I know, not your problem, but you can inform him.

Jack
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Old 10-22-2007, 06:06 PM
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That's what i thought. It would just lower the comp. I just wasn't 100% sure if the bore spacing matched up.
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