[HWYSTR455]

That's good advice Cliff, though I have used those aftermarket limiting cams with success. And the order is basically what I was suggesting too. Vacuum last.

And very true, most aftermarket weight/spring kits are junk. You can use the springs, but never use the weights. (only OE ones as you suggest)

Yes, you can take it a step further steve25, and monitor the vacuum during driving and det conditions, but in general, just by load and throttle position, you can kind of figure out what the vacuum is doing anyway.

One thing I do is put a hand vacuum pump on the advance can while running, slowly add a pump at a time, read the value, and the timing. You can chart a can the same way.

Most aftermarket adjustable cans have a limit of about 9 turns, if you go past that, and the screw comes out, it's next to impossible to reinstall it. (and you end up having to replace the can)

If you look at the Crane adjustable can kit, it comes with the limiting plate/cam:

https://www.summitracing.com/parts/c...00-1/overview/

Accel makes the cam separately, but I can't find the number right now.
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