HEI distributor tuning problem - The 1947 - Present Chevrolet & GMC Truck Message Board Network

WadmalawJoe · 03-14-2013, 07:09 PM

Alright I have an update, I bought a vacuum pump and a multi-meter that had the tachometer feature as well.

So here are my findings;

With advance unplugged and port capped
RPM's drop to 650 and timing is 12 degrees ahead
Rev up to 3,000 RPM's and timing goes to 32 degrees ahead

With vacuum pump, I pumped it to 10 and checked everything, then pumped to 20 and nothing changed so I left it at 20 for testing.
Idle is 820 RPM's and timing 30 degrees ahead
Rev to 3,000 RPM's and timing goes to 50 degrees

So what's my next step?

03-14-2013, 07:09 PM	#19
WadmalawJoe Registered User Join Date: Oct 2012 Location: Ravenel SC Posts: 317	Re: HEI distributor tuning problem Alright I have an update, I bought a vacuum pump and a multi-meter that had the tachometer feature as well. So here are my findings; With advance unplugged and port capped RPM's drop to 650 and timing is 12 degrees ahead Rev up to 3,000 RPM's and timing goes to 32 degrees ahead With vacuum pump, I pumped it to 10 and checked everything, then pumped to 20 and nothing changed so I left it at 20 for testing. Idle is 820 RPM's and timing 30 degrees ahead Rev to 3,000 RPM's and timing goes to 50 degrees So what's my next step? __________________ Toys/projects Many toys, not enough time to play! My youngest son and I picked up a 69 Chevy C-10 on 1/7/22, this is my second 69, it was 10 years ago that I had my other one. So I’m back!!!



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