Could use some help, Ive done some searching but still cant get it. Im installing a pro billit distributor from msd (8361). Im looking at the curves and trying to match the curve on my current distributor. All I know is that Im set up with 16 deg @ 1000rpm and its all in by 3000 total is 38 deg. What I dont understand is the stop bushing, does it limit the total timing ? And is the initial advance built into the distributor. I dont see 16 deg crossing over 1000 rpm on these charts.All of these charts show less than 5 deg at 1000 rpm, I think Im confused on how this initial and total timing is calculated. Can some one explain this to me, my brain feels like squash! Thanks graemlins/clonk.gif

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The stop bushing controls how much centrifical advance you have. So if you want 38 deg total you will want to use the blue bushing which is 21 deg if I remember right and set 17 deg inital .

17 inital plus 21 centrifical equals 38 total.

Remember if you are using a vacume advance, make sure it is disconected while setting your timing.

You control how soon the total comes in by the spring combination. I think I am running a light silver and a light blue spring in my set up and I have total advance in by 2800-3000 rpm.

I hope this helps,
Nick