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Old 11-24-2025, 06:09 PM
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65madgoat 65madgoat is offline
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Default Stock bore pistons 455 -- anyone ever see 10 over original pistons?
Curious if anyone has ever seen a factory 455 Pontiac engine with 10 over bore standard GM pistons originally in an stock block?

This engine builder friend of mine says he has seen them occasionally over the decades.... wondering how uncommon.

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