Prestolite Vacuum advance chamber

Anyone with knowledge as to what this fits?

Im fairly sure its Mopar. but no idea the application

They are adjustable to a degree , spring and shims drop in to tailor opening rate and I think you can limit how much it opens , big block and small block will be different as the rotation is different , should fit a dual or single point?

Maybe ask Joesixpack , Bill Cowger , he sells a lot of that stuff.

It is a dual point type. Singles are different arm. Right hand so small block and first gen hemi. What stamp # on arm, I believe should be 8. That number sets the max advance in distributor degrees the vacuum can apply.

Not the correct number for the later dual points on the 340.

.

Thought was small block.
Number on the arm is a 7


Thanks all

Curious where that picture came from but it is wrong. That part number 2875776 is for a SINGLE point distributor 340 auto in 69. The single prestolite type can has a longer length at the hole that connects to breaker plate. DP is shorter at that bend. Also, Prestolite single point distributor vacuum can carried the IBP- part number. IAZ is a dual point number. Prestolite did make parts for the single point in MOPAR parts boxes.

67 273 dual point uses 1843034 used IAZ-2023RG
68 340 DP uses 1689765. used IAZ-2023RA

The Prestolite books do not cross the RF to those distributors. Again, the low vacuum arm #, 7 is not typical for late model Mopars.