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Old 09-09-2008, 05:49 PM
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I had the same problem with a 383 it would run fine until you got up in the rpm then it would start to rattle.

Put some 110 octane gas in there and see if it clears things up. Mine seemed to be worse on the hot days so you might want to run a cooler thermostat.

10.75:1 is pretty high for a street car generally 10:1 is the limit for pump gas.
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