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Old 05-17-2012, 09:58 AM
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Originally Posted by Thumper33
Hey guys i'v built a 383 stroker 10.82 to 1 compression the car is talking to me when I shut it down. the timing is set correct and I'm running 94 octane someone told me if I used a colder plug it my correct the issue.

Your thoughts would be appreciated thumper 33
It could be a few things so I suggest trying each one seperately and see if it helps before going to the next. Not necessarily in this order.

1. Carb fuel mixture needs adjusted
2. Idle is set too high. Try idle at 650-700
3. Timing may need retarded
4. Too high operating temp.
5. Gasoline containing alcohol
6. Spark plugs too hot

There are other reasons for run-on such as high carbon deposits in the combustion chambers. Sharp edges in machining processes can also cause run-on because they can cause "hot spot" so these should have been smoothed out during the rebuild.

What carb are you using and what temperature does the motor run?
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