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1975-77 Pontiac Good Used 500557 Bare Block 400 CID/2 Date Choice I 16 5, H 26 6 | eBay
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CAL 1976 PONTIAC 400 Zj Engine Block 500557 Firebird Trans Am Formula Gp Gto V8 - $359.10 | PicClick
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Almost know what 400 it have.. - Second Generation Pontiac Firebird (1970 - 1981) - Firebird Nation
