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Someone correct me if I'm wrong but, the D15B2 and D16A6 heads are identical with the exception of the cam profile. 'A6 pistons in a 'B2 will murder your compression... The compression calc says 7.86:1 (Stock 'B2 compression is 9.2:1). A 'Z6 head and gasket will only bring that up to 8.5:1.
A stock D15B2 bottom end with a 'Z6 head and headgasket will put you at a much healthier 10.1:1.
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