Leaderboard

Usually it will be the pick-up. I've had the same thing happen to me a couple times over the years. The last time was on my 69 convert. Brand new dizzy, ran fine for a few months. Then it would start and run fine till it warmed-up under the hood (not over heated) and it would die and not start until it cooled off. Now I keep a replacement dizzy in the garage. (Plug and play) I also have an extra coil, but I would start with the pick-up/distributor every time.

Coils are a likely place for intermittent problems. It sounds like you changed the coil, though. If you changed the coil and the problem still happens, then the second chance is the wires going to the coil. One idea is to install a test wire from the coil to inside of the car. Monitor the voltage on the coil with a voltmeter. See what the voltage is when the car runs, and see what it is when the car does not work. The paper clip trick works well, but it is a simple test of the system for a very short period of time. When the coil fires 4000 times a minute, it will heat up and react differently.

I think Mach1 Driver is right. Your options will probably come down to try another pick up coil, if that doesn't fix it, then another ignition box. If when there is no spark and you immediately do the paperclip test and that triggers the MSD box, I'd suspect the magnetic pick up again. I've been using the MSD 6ALN with good luck. It's basically a more robust version of the 6AL. Performance is the same as a 6A or 6AL, just built more robust for dirt circle track racing. They're more expensive so wait for a sale if you can. I recently purchased another one for another project. At least the 6ALN doesn't have a label anywhere that indicates made in China.

It's not complete yet. I'm building the quarter extensions out of sheet metal and re-shaping everything to fit together. My car is back on the rotisserie and another convertible is going on the chassis table for a bunch of metal parts. I'll get back to mine sometime.

well Dad, you wont have to worry when he goes out on a date, lol