SBM "MagnaVelocity" mushroom camshaft.

Poor mans....ah, whatever. Good grief :rolleyes:

Im sure many builders here who’ve been around a while know why the mushroom lifter cams “as being discussed” came to be with Mopar.

Here’s a quote (from another forum) from someone out of Concord, NC who was involved in NASCAR:

“You are correct. I am a retired NASCAR engine builder, 28 years building engines for Hendrick Motorsports. I was hired in 1993 by Randy Dorton to become HMS Engines 4th engine builder. I got my start in the late seventies helping build engines for a couple of the smaller Chrysler teams. At that time all NASCAR Winston Cup Grand National Teams were just a few years in trying to make the smaller 357 engines work after NASCAR banned Hemi's and Big Blocks. We used the mushroom tappet cams because at that time roller cams were not permitted mainly because good roller lifters which could endure 500 miles of 200mph racing at high RPM and high valve spring loads without breaking could not be found. Mushroom cams allowed for a more aggressive profile to be run over a conventional flat tappet grind”

Plenty of other info-knowledge out there as well.