Posted By: Hangtowner
Distributor vacumn cannister markings - 10/09/21 11:42 PM
I have two new vacuum cannisters from Summit. One is stamped AH-10 and the arm starts to move at less than 5 inches. The other is stamped AH-6 and the arm starts to move at 10 inches. Are they miss-labeled? Which one is the usual can for a 74 440 HP?
Thanks, Ken
Posted By: lewtot184
Re: Distributor vacumn cannister markings - 10/10/21 12:27 AM
the number should mean how many degrees are in the unit. check to see if you can stick a 3/32" allen wrench into the nipple and connect to a screw. if so the units are adjustable for vacuum pull and you can pretty much set them were you want. the 10 would be close for a stock 440.
Posted By: Sniper
Re: Distributor vacumn cannister markings - 10/10/21 01:00 AM
the number on the arm usually refers to the timing advance, not the vacuum. the vacuum is adjustable as mentioned.
Posted By: Hangtowner
Re: Distributor vacumn cannister markings - 10/10/21 11:19 PM
The arms are stamped opposite to the ink stamping on the cannister. the 10 is 6 and the 6 is 10.
The notches on the arms are the same, so I think the advance that each unit gives is the same. The allen screw seems effective on one more than the other.
So I will by the arm stampings and ignore the ink stamps.