Thread: Pontiac V-8 BLOCK code Y4
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Old 06-02-2007, 10:51 PM
doubleClutch doubleClutch is offline
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Join Date: May 2007
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dated 77, block # 500577,y4 samped on front. I know the 577 usually has thin webs, but the guy told me this isn't a firebird block, anyone else got info on the y4 stamp with the 500577.

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