Points vs Electronic ignition and Pulley timing mark

[Phil Waterman]

Hi Mark

Have you tried shorting out one plug at a time to see if you can find the one that doesn't make the engine change beat?

Even compression across all the cylinders would normally indicate cylinders and valves are not the cause of the problem.

The only exception to a valve sticking on closed on a flat heads that I can think of is with the flat heads have hydraulic lifters. My 49 Lincoln has a big flat head that has hydraulic lifters but the truck version of the same engine has solid lifters.

Keep us posted on what you find.

Cheers Phil