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Part wanted. Clarks C7877
Posted by: 2ragtops ()
Date: July 30, 2020 05:57AM

I have been using a NOS vacuum retard and friends are telling me the Clarks design works better. But they are out of stock.

Anyone have one to sell, so I can try it?


Bob Bauer

Show-Me Corvairs

1966 Monza Convert 140 P/G with A/C, plastic wheel with tele-column am-fm posi-traction
1966 Corsa Convert 180 wood wheel tele-column am-fm sport steering posi-traction
1965 Corsa Coupe Crown V8 temporarily red lined for repair
House Springs, Missouri

Edited 1 time(s). Last edit at 07/30/2020 08:05AM by MattNall.

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Re: Part wanted. Clarks C7877
Posted by: JimBrandberg ()
Date: July 30, 2020 06:10AM

I looked it up because of the reference to "vacuum retard".

C7877 is a vacuum advance/pressure retard. I see in their description they say set timing to 18 degrees which I would disagree with on a turbo distributor. If you retard the initial timing 6 degrees it will be 6 degrees retarded at high speed as well.

If you're using a different distributor with a broader advance range it's a different story.

I believe the advantage it has is to provide some additional advance when cruising down the highway at light throttle.

Jim Brandberg
Isanti, MN

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