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Ron, I have never run the 650, but a local racer had one in a 499 with ported 440-1 heads, 3200 lb car went 9.70s If I recall correctly. I would think that cam should make within 50 hp of a big roller?

Sasquach on here really enlightened me on this cam...I only ran 1.5 rockers...OTB -1's...not even port matched...a 1050 Dom with the 2" adapter...26 degrees of total timimng and was way fat on the tune...I wanted an easy to dial motor....like I said...footbraked off a 2 step..left 10.75 on the window for a whole season running it....He told me low 10's were easy with my combo if I'd have turned it up a bit... I'd say this cam with an excellent port job could take a 3200 car down to 9.50's if you squeezed it hard....everyone fears mech tappet cams....do it right and they are cheaper and close in numbers.