I have a rattle. Sounds like it's in the engine. .. mechanic said it's spark rattle? Can it be anything else. ...4 bolt main 350/350 tranny occurs when acceleration mostly

Asked by May 26, 2014 at 05:17 PM about the 1982 Chevrolet Caprice Classic Coupe RWD

Question type: Maintenance & Repair

new headers new water pump new 600
holley carburetor with electronic choke new
intake manifold new 140 amp alternator
spark plus and writes electronic fuel filter

2 Answers

9,945

More than likely is a lifter rattling, Sparks don,t rattle but lifters do : )

75,585

Could be. You'll first need to set the base ignition timing. If you're "power tuning" it you may advance the base ignition timing up to 4°. With the performance items that you mentioned plus power tuning you definitely need to be running premium gas as well. Most often denotation, as it's properly called, is caused by using fuel that is too low in octane. I'd recommend 93 or higher. HTH. -Jim

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