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Not unless you care to. You can even run them together in series. I.E. electric pump feeding the mechanical pump.

The only day this week with no rain forecast. Amazing... I am stoked!

I wonder if the Holley regulator diaphragm is the same size? Maybe even the diaphragm they use on the vacuum secondaries?? Bring it in to Pat...

Timing, as they say, is everything. This 383 likes 16* initial- vacuum is at 15" now. Got mentally prepared to weld up the advance slots and start trial and error adjustment to limit the mechanical advance. Pleasantly surprised to find out the motor has a MP distributor and adjustment is as easy...

I bumped the initial up to 12*, which brought my total back to the 45* where it was before I started this whole thing... Just ssounds too high- all you hear and read about is how BBM's like 32-36 total. Seems to like it, vacuum has bumped up to 12" Still get an occasional spit out of the carb...

What is a normal vacuum reading at idle for such a mild cam? 383/ .474 purple shaft/ Holley 600 DP/ stock distributor Trying to get the 383 in my new Dart tuned right. Got timing set to 32* total. Hooked up vacuum gauge and was shocked to see 5" on the gauge. Adjusted mixture screws by idle...