Need help on new rebuild
A factory correct '68 4 speed distributor is going to have a very quick advance curve in it. If the engine is set at 10* BTDC at 1000 rpm, it will have 0* around 700 rpm. That was on purpose to meet emissions at idle and still have good power off-idle as you put it into gear.
You can give it a little more advance. You can do that safely because there's no load on it. Additionally, if its a factory curve, Plymouth spec'd it on the conservative side for heat soaked engines.
This graph is based on the 68 Plymouth FSM. Dodge sometimes used slightly different initial and curve specs but were similar.
Is this a generic rebuild, or the correct original '68 4 speed distributor?
A factory correct '68 4 speed distributor is going to have a very quick advance curve in it. If the engine is set at 10* BTDC at 1000 rpm, it will have 0* around 700 rpm. That was on purpose to meet emissions at idle and still have good power off-idle as you put it into gear.
You can give it a little more advance. You can do that safely because there's no load on it. Additionally, if its a factory curve, Plymouth spec'd it on the conservative side for heat soaked engines.
This graph is based on the 68 Plymouth FSM. Dodge sometimes used slightly different initial and curve specs but were similar.
