The Ford Barn - View Single Post - Help decipher GM distributor vacuum canister numbers

40 Deluxe · 01-12-2021, 10:35 PM

I found an adjustable vacuum advance unit online (but don't remember the source). It adjusts with an Allen wrench through the vacuum nipple, just like a Ford. In fact, it looks just like a Ford, only with Chevy mounting.
As you tighten the Allen screw (turn clockwise) it compresses the spring to slow the rate of advance and and also reduces the amount of vacuum advance.

01-12-2021, 10:35 PM	#9
40 Deluxe Senior Member Join Date: May 2010 Location: now Kuna, Idaho Posts: 3,779	Re: Help decipher GM distributor vacuum canister numbers I found an adjustable vacuum advance unit online (but don't remember the source). It adjusts with an Allen wrench through the vacuum nipple, just like a Ford. In fact, it looks just like a Ford, only with Chevy mounting. As you tighten the Allen screw (turn clockwise) it compresses the spring to slow the rate of advance and and also reduces the amount of vacuum advance. Last edited by 40 Deluxe; 01-12-2021 at 10:44 PM.