ignition ping when vacuum added

[37fatfender]

I'm confused the picture in Holleys installation instruction say the port in the metering block is "Timed spark vacuum source, Connects to Distributor advance system". That's were I have mine connected. I just read Richards download and will try it.

[51 MERC-CT]

Originally Posted by 37fatfender

I'm confused the picture in Holleys installation instruction say the port in the metering block is "Timed spark vacuum source, Connects to Distributor advance system". That's were I have mine connected. I just read Richards download and will try it.

Don't be confused just hook it up to 'Full manifold vacuum' before doing any of the procedures.

[JSeery]

Originally Posted by 37fatfender

I'm confused the picture in Holleys installation instruction say the port in the metering block is "Timed spark vacuum source, Connects to Distributor advance system". That's were I have mine connected. I just read Richards download and will try it.

The instructions are for a distributor that requires a "timed spark vacuum source".

[Richard in Florida]

Originally Posted by BUBBAS IGNITION

ATTA boy Richard !!!
ALL should download print and just follow the directions. Especially when using a vacuum canister...

Thanks for the flowers, Jim. I appreciated your mentoring and patience.

[Charlie ny]

Richard.......your article is worth a lot of $$$$$$ ,thank you for this great gesture !
I build a fair number of these distributors and dial them in to run well on
average but as you have so eloquently pointed out an average setting will
in all likelyhood leave room for fine tuning.
When we visited Ron last summer he told us about you .
Gracias,
Charlie ny

[51 MERC-CT]

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Originally Posted by 37fatfender

I'm confused the picture in Holleys installation instruction say the port in the metering block is "Timed spark vacuum source, Connects to Distributor advance system". That's were I have mine connected. I just read Richards download and will try it.

The 390/8007 Holley was meant originally as a replacement carb. on early emissions systems cars. The "Timed spark vacuum source" was connected to one of two ports on the dual port distributor can. The can provided both vacuum advance and vacuum retard in an effort to control emissions.

[37fatfender]

51- Merc, Thank You and everyone else who answered this thread. I never saw one of those two port distributors.

[51 MERC-CT]

Originally Posted by 37fatfender

51- Merc, Thank You and everyone else who answered this thread. I never saw one of those two port distributors.

Had one on my '73 Ranchero. Was about the first year Ford used them in an effort to meet the new emissions requirements.

[Richard in Florida]

Originally Posted by Charlie ny

Richard.......your article is worth a lot of $$$$$$; thank you for this great gesture!

Thanks for the kind words, Charlie.

All through the design and building of my car I enjoyed sharing everything I learned or dreamed up that could help the next guy: "aluma-peas," setscrew advance range adjustment, plug wire looms, four-barrel tuning, my "road rig," my homemade distributor machine, T5 selection and installation... MAN! I've had a lot of fun!