Alan

Sounds like I'm barking up the right tree. I had a Holley 600 on a small block Chevy many years ago, and never could get it to run just right.

The info on the diode to stop run-on is interesting, and makes good sense. I have an old airplane, and there was a mandated modification to install a diode on the Master power relay to prevent voltage spike when turning power on or off - ignition is separate from the battery/charging system on the plane, but the principle is very similar. I'll give it a shot and see what happens.

I really appreciate the articles you've posted on your site regarding your truck. I was looking at air con retrofits earlier, and saw your super-clean installation of the Old Air system. That's next for the Green 71, but first she needs to run right.

Best

Paul Domeier
Green71