Quote:
Originally Posted by turp mcspray
This sounds to me like a vacuum advance issue. Unhook the advance, and then go for a drive. A lot of distributors have lots of vacuum advance (like 24 degrees) to make up for a really weak timing curve. If you set the initial timing for more advance than stock, the vacuum can may push it too far during light throttle, high vacuum, driving. If this is the case, you simply need to limit the vacuum advance. About 10 degrees is a good number for a performace type of timing curve.
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Agreed, if the knock occurs just at low speed/part throttle, it's more than likely a vacuum advance issue. BTW...if it's a stock 307 with 2BBL you only need to run regular gas. You are just wasting your cash with premium. It will do NOTHING to improve economy or performance.
You might find this interesting...
http://www.consumer.ftc.gov/articles...ctane-gasoline