I think the comp. ratio will be around 11 to 1. Dad doesn't really care about it being pump gas since we live close to a Muni airport. (100LL from the tanker trucks) It's still 3 something a gallon but it smells better than 93 when burnt.
Now to make sure before I let him know the problems he may run into, I said it was a RA4 replacement, but it's what I think it is because of the duration. It's a Performer RPM cam. RA4 was 308/320 right? The lobe separation is the same, and as for the 670s, I thought they flowed the best of any head on the intake side and were choked off on the exahust. I probably totally goofed calling it a RA4 replacement didn't I?
