FBO's black HEI ignition box

MidnightSwinger said

Is that on the black boxes or the new ones? I’ve got one of the new ones waiting to go in the swinger for a 383 that I plan to rev.

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I‘m not sure which box he was talking about when he said it doesn’t retard with RPM.

Like I said, they ALL retard with RPM. How much and when it starts are variables.

Thats why you need to test for it.

I was there when Don started talking about building his own ignition boxes. I said it was a waste of time. I still say that.