I have a similar cam (Piper 270) and 9.5:1 and run 93 oct, no problems, not
sure about 87 or 89 as I've never run the lower octane in it. Never a hicup w/
93, so I assume 89 might not be too bad.
3- ZS's, point ignition, MSD ignition, 16 lbs flywheel, 1969 TR6 engine.
Richard Seaton
RSH17@msn.com
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