Quote:
Originally Posted by 67gtospud
Reading through this thread and I don’t see mention of the flexplate at all. Is it new or used? What was used on the dyno? I know the op said he disconnected the converter to eliminate that, but was the flexplate checked? I’ve diagnosed multiple cracked flexplates over the years that have sounded like a spark knock at idle and faded as rpm raised with no load on the engine.
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Way, way back in these 950+ posts, I suggested removing the flexplate completely and running the engine just to make sure. My dyno set-up requires a manual transmission flywheel, not a flex plate to be connected to the dyno drive plate. It's an old Superflow SF-901 about 20 years old. Set-ups have changed over the years and are much easier now. I have no idea how they were set-up on their dyno. But I agree this may be worth a look.