RPM Drop From Nuetral to Gear

Mattax said
That looks like a Mallory made MP distributor. It seemed like a great idea because of the adjustability, but its not as good as Chrysler built ones in some ways.

Yeah, after taking this one apart several times, I'm certainly not impressed with the craftsmanship.

Mattax said
Replacing the heavy spring with a second light spring as you did was the best place to start. Because with the Mallory style slot adjustment, shortening the advance slots reduces the amount the weights move out. In other words it does not increase the preload on the springs. The heavy spring has a long loop in it, so it only slows the advance once the rpms get up to 2000-3000 rpm. It does nothing at idle rpm, and with the total slot distance reduced it may do little to nothing at the top.

That's exactly why I took the heavy spring off. It wasn't doing anything once I shortened the slots. I also thought maybe because only one light spring was doing something at the lower rpms, maybe mech advance was being inroduced when the car was in neutral at idle vs. in gear at idle, exacerbating my issue.

Mattax said
Some pictures of the distributors here:
http://www.heritech.org/cuda/Dist.html

Thanks for the link and the help. I appreciate it!