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Quote:
Originally Posted by 38 coupe
The bump is where you line up the initial ignition timing, the details of 2 or 4 degrees BTDC is academic.
There is not a mechanical advance in the factory 8BA style distributor. The factory distributor works very well if you have a stock or near stock camshaft, a single stock carburetor, and you hook up the vacuum advance line to the correct port on the carburetor. JWL did extensive testing and found a stock 8BA style distributor provided optimal timing for maximum power with a stock engine.
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Hmm...so what you're saying is just set the timing so the bump lines up with the pointer. That would imply that the bump is at the correct number of degrees before TDC. I do not find it academic to ask how many degrees before TDC the bump is.