360 Tune Up

Thanks for the challenge, guys. I had already checked this distributor and since it was new, I ASSumed it was ok. After mapping the centrifugal advance curve, I plugged in the vacuum line to find that the diaphragm was open. No vacuum advance. So, I'm starting over literally. Fortunately, I had another distributor and mapped it. I also returned the Edelbrock 1406 to base #1 tune.

The 2nd distributor has the following map.

1. Idle (750 rpm) 7 degrees
2. 1000 rpm - 12 degrees
3. 1500 rpm - 24 degrees
4. 2000 rpm - 26 degrees
5. 2500 rpm - 28 degrees
6. 3000 rpm - 31 degrees
7. 3300 rpm - 34 degrees

The vacuum canister on this one has 15 degrees of advance. I get 17-18" of vacuum at 750 rpm and 22" at 2000 rpm. Vac advance is hooked to manifold vacuum.

The lack of vacuum advance would explain the higher temps cruising under load at 2400 rpm or so. Correct? It is supposed to get hot this weekend. So, I plan to do some more temperature testing. I have a new electric fan coming today and hope to get it installed tomorrow. Mileage tuning may have to come later.

What is the recommended amount of total centrifugal advance and the recommended total of vacuum advance? Is 34 BTDC about right?

Thanks for your help!