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I hope this isn't the case but I shall find out after I change the coil and a couple other things. Thanks for the reply.

I reset the timing after I converted from points to the ignitor.

No heat riser on it. I am running stock 440HP exhaust manifolds.

I did not change the timing.

440, The heads do not have hardened seats. I am using the redline lead substitute.

I will check that again, too. I checked it the other day and it didn't look wet or cracked. Thanks.

I run premium fuel and add Lucas oil octane booster. I also use lead substitute, fwiw. Again it only does it when I am moving and up to operating temperature. Right now when it idles or is revved it does not pop.

Thanks, I will change it that is what I thought.

My 413 is having a new issue. It has a pertronix conversion including their coil. Worked fine last year and until a week ago, no problems. The ballast resistor is bypassed with a soldered wire. Runs fine when cold, as it reaches operating temp, it starts to exhaust pop and lose power. I thought...