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v2rocket_aka944 v2rocket_aka944 is offline
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Join Date: Mar 2008
Location: Rancho Cucamonga, CA
Posts: 3,414
944S pistons have a larger dish than 944 8v - the 944S HEAD has a smaller chamber with a net higher CR.

944S pistons under an 8v head would be 9.0-9.1:1 compression range, stock US 2.5 8v is 9.5:1 from 82-87 and 10.2:1 in 88.

you'd have to cut valve reliefs in the "S" pistons to clear the NA valves.

...do you have a nice set of 944S pistons available you're trying to do something with?
Old 09-04-2018, 01:13 PM
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