Timing curve Im lost

[Mwilson]

My car idled and ran great with the old distrubutor locked out at 34-36 but It was really hard on the starter & had no vac advance. Well I went and bought a MSD "Street fire" Hei distibutor added the 10,000 RPM module with rev limiter and crammed it in there. I cannot get it to Idle at all now??? Its sitting at 7* initial with 36* total I havent even begun to mess with the Vac advance. The best I can figure I need more initial with my 266 @ 50 cam? The only way I see to do it is build up the weights so to limit the amount of mech advance? Someone please help me with a good baseline tune with this HEI distributor. If I try to idle below 1,800 in park it dies in gear????

[rookie]

if your still online P.M. me with your phone #, thats alot to cover when ya type as slow as me.

[Mwilson]

PM'ed thanks

[Mwilson]

Nice talking to you thanks alot, I'll post up on how it goes

[rookie]

How did your initial test with the shim go?

[Mwilson]

It worked great! I just fired it up and Im at 26* initial and 35* total idles perfect. Now I can play with the vac advance!

[rookie]

Don't use the vac. and shim together, the vac. adv. should take place of the shim or you will have to much initial.

[Mwilson]

Originally Posted by rookie

Don't use the vac. and shim together, the vac. adv. should take place of the shim or you will have to much initial.

My vac is adjustable I can turn it down to whatever I want. I ended up with about 26* initial what would be a good initial with vac advance?

[rookie]

I'm not sure how your shim works but lf you run that you may not need the vac.adv...

The way I did mine was running 1 light spring 1 med spring then with out the vac. I set my total timing to 36, and then I hooked up my vac. and adjusted it to give me about 40 at part throttle so it’s only adding about 4 degrees this puts my initial at about 24 to 26 range with those springs.

Your combo may not need that much.

If you experience detonation pinging under load i.e. going up hill, part throttle kind of stuff, then pull some timing out with the vac. Pod.