[rob frink]

Mikey,

I don't like vacumn adv. For a performance street motor, I just don't see any need for it since the timing requirements can be done with mechanical and intitial setting.

I run 20 BTDC initial timing. and 32-34 full advance....in by 3000rpm. So I needed my MSD billet distributor to provide only 12degrees of mechanical advance. The bushings that came with the distributor allowed 18 advance (black) which was way too much. So I machined my own bushing tolimit the advance travel to 12. It turned out to be .400" diameter.

I'm a strong advocate for running lots of initial timing on hi-po street motors.