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Old 09-20-2012, 05:23 AM
454C10 454C10 is offline
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I found a 43cc rating on the dome for those pistons. however not sure that is right. but if so the cr should be 10.75:1

887cc/cylinder (433 cid)
120cc heads
10cc head gasket (0.040")
4 cc piston under deck (-0.015")
+43cc piston

(887 + 120 + 10 + 4 -43)/ (120 + 10 + 4 - 43) = (887 + 91) / 91 = 10.75

You don't need to machine the chambers as these are big open chamber heads. However, if you want to, you can have the pistons cut down to reduce compression a little.
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