Correct Vacuum Advance for 69 427/400

[Chuck G.]

Am pulling the distributor for a rebuild/recurve. Have a generic vacuum advance on it now. One catalog sells the #360 and says it is correct for my application, while another catalog sells the #363. That catalog states that he #360 is for 68 only. Which is the correct vacuum advance for my 69 427/400 automatic? Thanks in advance. Chuck

[William C.]

Re: Correct Vacuum Advance for 69 427/400

For the 390-400 hp distributor, I have three non-GM references from 1969 calling for the 360 vac unit, for what it's worth. (National Automotive service manual, Motors Parts/Labor and Chiltons Parts/Labor) (926 Dist)

[John H.]

Re: Correct Vacuum Advance for 69 427/400

Chuck -

The chart in the Chassis Service Manual shows the 1111926 distributor using a "C-3955" vacuum advance unit, with specs of 0 advance @ 7" Hg., and 12 degrees @ 12" Hg. Have no idea how this relates to any stamped ID on the vacuum advance unit.

[William C.]

Re: Correct Vacuum Advance for 69 427/400

For what it's worth, John's specs match the specs for the '360

[Terry M.]

Re: Correct Vacuum Advance for 69 427/400 *TL*

Delco-Remy Test Specifications show:
For 1111926 distributor Vacuum unit should be 1115360. Sounds like we are all singing the same song.
It also shows the same vacuum unit information John has provided.

[Chuck G.]

Re: Correct Vacuum Advance for 69 427/400

Thanks for the info, guys. Appreciate it. BTW, a company which is a Paragon of originality sells the 360 as correct, while a Corvette company Centrally located sells the 363 as correct, and the 360 for 68 only. Chuck