85 Fleetside
Junior Member
- Joined
- Jan 13, 2020
- Posts
- 5
- Reaction score
- 4
- Location
- Indiana
- First Name
- Scott
- Truck Year
- 1985
- Truck Model
- C10
- Engine Size
- 4.3
85 C10, 4.3L V6, 3sp manual, 350K miles, one owner. Curious what the centrifugal advance and vacuum advance should be on a stock V6 HEI distributor with ESC. My GM factory manual does not give specifics on this. The base timing matches the emission label which says 0 degrees with the vacuum advance line disconnected. Vacuum advance is 2 deg with 5" applied and seems to max out at 8 degrees with 10-15" (applied with a hand vacuum pump). With the vacuum line connected I am getting about 22 degrees BTDC at 2500 RPM. Does all of this sound reasonable? The truck starts easy and runs pretty good but does seem sluggish at times.
