Hi,
I recently installed a Proform distributor in my 71 Challenger R/T because the MPP distributor had an advance curve that was too fast. So I thought I would pass on the advance curve specs that were given to me when I called Proform tech support:
P/N 66992 (BB Mopar)
Mech. adv. starts @ 800 rpm.
Mech. adv. ends @ 3000 rpm.
Total mech. adv.: 24 deg.
Total vac. adv. in canister: 15 deg.
P/N 66990 (SB Mopar)
Mech. adv. starts @ 800 rpm.
Mech. adv. ends @ 3000 rpm.
Total mech. adv.: 24 deg.
Total vac. adv. in canister: 15 deg.
Bench testing the vac. adv. canister, I found the following: using a 3/32 allen key to turn the adjuster fully clockwise (CW), the canister begins to advance @ 7 in. Hg. To delay the vac. advance, you turn the adjuster counter-clockwise (CCW). Each turn delays the onset of the advance by 1 Hg. For example, by turning th adjuster 1 turn CCW (from full CW position), the vac. advance begins at 8 in. Hg.
Maybe this will help someone if they are considering either of these distributors.
