I run 95 octane non-ox gas in my 68 Lemans HO. I have my total advance set at 36 degrees and it will ping with 91 octane with a bottle of booster added, so I tried the straight 95 and she runs great with no ping and lots of power.. My motor is 320 hp, but feels more like 350 plus. The engine has 124,000 miles on it, never rebuilt....just timing chain and gears replaced. Stock except Summit cloth air cleaner element "K&N copy" in the original air cleaner...with lid flipped for more flow, Pertronix guts in the stock distributor,mandrel down tubes, tail pipes, and Dynomax mufflers. I will say this, after I had this exhaust system put on my car, it was NIGHT AND DAY difference in power.
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1968 Lemans 350 HO
55 Chevy 210 2 door post, future Two Lane Blacktop car
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