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Bill, I beg to differ.
The 220HP 944 turbo has 38/36 mm front pistons, then 40/36 mm pistons from end'87 to '88. How do I know? I have one of each in my hands right now. The 964 pistons are somewhat smaller. Hydraulically, the larger pistons provide more clamping force, and more heat transfer.
Regards, GeorgeK
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