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Old 09-17-2002, 03:14 PM
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Post What gas should I use

I have a 72 vette block with 91 Tbi heads on it. The block has dished pistons and origonally came with smog heads. The TBI heads were milled and now probably 63cc's. I have a very mild cam. With alsmost no over-lap so this is true compression. I guess i have around 9.5 to 1 compression. Can I use 87 octane gas with this set-up? or would 89 octane be mutch better? And how would u tell if you use to much octane. This car will be an every day driver and it is for street use only.

Thanks in advance

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Old 09-17-2002, 04:32 PM
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I would use the least expensive unless you can afford more. It sounds like your engine is not to radical so I think you could tune it for 87. Set the timing so it is retarded enough so that you don't get ping or detonation. My 428 runs fine on 87. I did find out that Chevron seems to run much better than any other brand. It runs like heck on Conoco. If 87 doesn't work for you go up to the next grade. It is probably cheaper to upgrade than to put in additives unless you make your own.
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Old 09-17-2002, 09:44 PM
E.T. divided by $ spent= Speed
 
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Nitromethane or jet fuel w/ 2 bottles octane boost.Or 93octane could work too.
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Old 09-17-2002, 09:48 PM
E.T. divided by $ spent= Speed
 
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You could get by with the cheap gas but you'll have to knock down the timing.I hate doing that so I just run 93octane.
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