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08-05-2015, 09:33 PM
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#11 |
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Senior Member
Join Date: May 2010
Location: ManchVegas, New Hampshah
Posts: 1,591
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Re: How to do an engine assessment on my wifes 81A?
I don't know if the C7RA-A head is equal to the 77 head listed in service bulletin 6000. If it is, that CR is 7.5:1. The 81T head has a CR of 6.2:1. My info comes from SB 6000 dated Feb. 6 1942. Both heads are for domed pistons.
If this engine runs well and has no strange noises run it as is. No need to fix something that ain't broke.
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