Quote:
Originally Posted by Formulajones
My bird is a stock RAIII 400 that has 10.13:1 compression and the stock 068 cam in it. Much like your claimed original 69 bird, very similar engine. It's not detuned at all, loves 34 degrees total timing and runs on 91 octane. With stock converter and only a 3.31 gear has gone 13.10 @ 104.5 mph. I drive this thing everywhere on pump gas, no additives.
Race gas does nothing for this car, I've tried it. If the engine doesn't need it, it's wasted money.
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I would ever do this with my concourse 69 numbers matching RAIII 400 Firebird Convertible. It's worth WAY too much to penny pinch like that. Better look at your plugs ….