20
« on: April 26, 2022, 10:43:29 PM »
Update problem solved!
It was the coil!
I’ve never seen a coil act like this. After thinking about it I guess it does. INDICATED timing on the damper showed it needed 30-40 to idle, running the rpm up would show the timing increase then engine would buck like it was pushing against too much timing ,but the coil couldn’t keep up.
Sadly here’s what we did to get there
Zeroed damper
Pulled front cover to check timing set ,all good .
Lashed valves ,solid lifter cam.
Swapped cap,rotor,wires with known good
Replaced plugs
Swapped in no less than 3 distributors all with Pertronics
Gave up for the night.
Next day engine will not start at all!
Smoked a Pertronics
Swapped in a coil….
Fired right up normal timing indications
Took it for several test drives
Adjust vacuum advance can.
All in all a hell of a way to tune up a 72 R code Mach 1.
Drove it some more