Testing the HiRev 7500

RustyRatRod said

We've literally talked about this on here for YEARS. It's been in nearbout every major magazine and publication at some point that these boxes do retard timing. I've seen several on a distributor machine do it myself. Now, I've never seen anyone test "just" a box, but from all the evidence, that's where it's coming from. I mean you can "see" a point ignition doesn't do it. That should tell you something.

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I'm not saying that boxes don't retard but I have seen timing retard go from 6ish degrees of retard to 1ish degree with the same box and two different types of distributors. On running engines not a distributor machine. I don't know for sure but I think the results will be the same on a distributor machine. Most test including this one are done with the same type of distributor. Self generating ac signal.