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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: darmentle on November 05, 2013, 11:31:35 am

Title: vacuum advance? again ?????
Post by: darmentle on November 05, 2013, 11:31:35 am

I just noticed that the previous owner never hooked it up where is a good place to plug it into on the carb i have a holley truck avenger. i haven't had any performance issue with disconnected.

Part2
So i connected the vacuum advance and now when i drive between 1500-2000RPM i hear a strange KEk kek kek sound coming from what i think is the distributor. it only does it under load and  goes away a little after 2000Rpm. Thoughts ?

Title: Re: vacuum advance?
Post by: 81_Chevy on November 05, 2013, 11:47:32 am

Try this: www.holley.com/data/Products/Technical/199R10268-4rev2.pdf‎

sorry if its a wrong link, cant open it on my school laptop. there should be an open port somewhere to connect it too.

Title: Re: vacuum advance?
Post by: darmentle on November 05, 2013, 12:06:29 pm

Thanks i see the little male fitting on the carb that says Timed Spark Vacuum Source Do i have to Check the timing after i hook that up .

Title: Re: vacuum advance?
Post by: rich weyand on November 05, 2013, 12:16:32 pm

No, you should always set ignition timing with the vacuum advance disconnected, then re-connect it.

Title: Re: vacuum advance?
Post by: darmentle on November 05, 2013, 02:58:00 pm

Thanks again

Title: Re: vacuum advance?
Post by: darmentle on November 05, 2013, 04:08:25 pm

oh i was gonna ask since we are talking distributors is there a difference in a normal HEI and MSD HEI i got the 6al box and wires just haven't got around to installing it . I was debating on getting the MSD  distributor is it worth the money
http://www.summitracing.com/parts/msd-8362/overview/