Electronic Distributors From Rick Ehrenberg
I guess the only way I'll know is to get the light map it out.
Absolutely. Yes. Do it. Post what you find. Everytime I've helped someone with this question about advance curve in any of RickE's distributors, the person hasn't followed up.
Here's the Chrysler built MP timing plot I made years ago
Another Boggie One
My best guess of the advance for Ehenberg's distributors based on his ebay ad at the time.
Too much advance at light throttle?
Me guessing again at what one of Eherenberg's ebay description means.
Performance Distributor in Stock Engine
I know there were other times I've been through this but those three are the ones I can dig up at the moment.
Don Gould has the only way I know of with the FBO limiter plate.
Welding is another way, and I know you know that. :poke:
Sometimes your parts bin, or someone you know, has a plate with shorter slots - that's another way.
8* is well within a stock HP range
I think this is the idea behind the advance curve in the MP vac advance distributors (which in some ads RickE claims to be copying)
The non-smogged 4 bbl v-8 had initial timing of 10* BTDC (LA), and 12.5* BTDC (B, RB) at 600 rpm or so.
When DC/MP decided to make up a performance magnetic pickup distributor for street use, they focused on a curve for good driving performance and considered 12* BTC an acceptable initial. That let them use an advance plate that was already in the bins, and covered their perception of what the typical enthusiast at the time had for engine mods. Honestly, I don't think they cared too much about idle quality. That team was very drag race oriented and we can see from the race (aka tach drive) distributor that the main goal with that was an initial timing that allowed easy starting. With both, timing was to be set at 2800 rpm and where idle timing fell was 'good enough'.
This a page from the instructions that use to come with the MP distributor and electronic ignition conversion kit.
https://www.forabodiesonly.com/mopa...mopar_performance_instruction-png.1715175314/