... was it was hard on springs. They were shot after 150 runs...
That's one of those trade-offs w/ using most -- if not all -- of the fast-rate-of-lift .904" flat-tappet profiles. The .875"-type SFT I ran on the street was much easier on springs and still ran hard. Faster isn't always better.
Never have been sure how "big" that COMP 290/.650 SFT really is compared to other cams. By the time you factor in the recommended .030" lash (IIRC), it's going to loose a lot of effective duration, not to mention .030" net lift over advertised. I know they SOUND big at idle, but...
