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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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Q: What is piston number z8222-4?
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