Gotta agree with Chip and 1967Tempest.
I'm running on 87 octane with my 400 4bbl 4speed and 3.55s, with a CR of 9.5 to 1. No ping or any other problem..... well a small overheating issue tho but that's all and it's not the engine's fault per say. It's that water pump problem that a lot of us are having. Tho it stays cool so far with a 160 thermostat.
__________________
Gary
Get in, Shu T Up, Hang On !
Member of the Baltimore Built Brotherhood
MY GTO built 4th Week of March 1966
"Crusin' Is Not A Crime"
Keep yer stick on the ice.
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