There are actually 3 different Z8222 pistons:
Z8222 ... dished with 4 valve reliefs 1.530 compression hgt
Z8222A ... plain flat top with 4 valve reliefs 1.544 compression hgt
Z8222G .. .120" dish designed to be used with 305 heads 1.480 compression hgt
8.2 to 1 with 60cc 305 head
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