I haven't done the etops on a 496 yet. I have actually tested a set on a 502. Not sure why but he bought the 496 etops and converted them for the 502. I didn't get to do a before and after but they looked and sounded good. They had changed the cam to one that was way too big for the applictaion and I was concerned about reversion. But, there didn't appear to be any so that's encouraging. It showed a 60 hp gain at the prop, but that was increased compression, cam change and reprogram on the ecu. That's all I know right now.
UOTE=Keith Atlanta;2908523]Bob, did you ever test the ETop?[/QUOTE]