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Old 08-28-2018, 12:57 PM   #17
Scooby Guru
Member#: 71875
Join Date: Oct 2004
Location: Montana

Manley uses 51cc head volume to calculate their CR:

With 56cc sti heads and those pistons and a 75mm stroke I get 7.9:1. 79mm I get 8.3.

Using the high compression 9.8:1 pistons destroked I get 9.0:1.
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