I don't think so, but not sure I know the difference. A lot of popping sound during deceleration. I get the same annoying sound at around 50mph. If it helps, the stock setup ran just fine with good throttle response, acceleration, and no backfiring.

Montana first time diy rebuilder.
1948 Five window, 3/4 ton, 216 motor, four speed, six volt, mostly original
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