123 Ignition Distributor Timing Curve, Curve for carbureted 2056 Options

[SteveNMaine]

I am looking for the basic timing curve settings for a 123 TUNE+ 4-R-V-P distributor for a dual 40 IDF carbureted 2056.

I have been all over the different forums and really looking for more specific information for my build.

Thanks.

[iankarr]

Since every engine is different, and the benefit of the 123 is the ability to customize the curve, there’s isn’t an “official” setting. Start by clearing all points, then add one for 8 degrees at 950rpm, and another one for 30 degrees at 3000 rpm. This should get you very drivable. As you drive, take note of where the flat spots and stumbles are and add points at those rpms. Experiment increasing the timing at those points until the power band smooths out and extends as far as possible.

Before you do anything, though, verify that the 123 is synched with a timing light. Rev the engine to 3000rpm and turn the dizzy until the timing light agrees with the 30 degree point you set. Then lock it down.

[SteveNMaine]

Since every engine is different, and the benefit of the 123 is the ability to customize the curve, there’s isn’t an “official” setting. Start by clearing all points, then add one for 8 degrees at 950rpm, and another one for 30 degrees at 3000 rpm. This should get you very drivable. As you drive, take note of where the flat spots and stumbles are and add points at those rpms. Experiment increasing the timing at those points until the power band smooths out and extends as far as possible.

Before you do anything, though, verify that the 123 is synched with a timing light. Rev the engine to 3000rpm and turn the dizzy until the timing light agrees with the 30 degree point you set. Then lock it down.

Thank you Ian. I used your videos to build my 2056.