MP509 Purple Shaft

That cam is like a light switch...its on, or its off. above 4000RPM = on, below 4000RPM = OFF! I put one in my 318 back in the mid 90's...it made it a dog around town, and it only ran o.k. at the track. My 360 handled that cam better, but it had higher compression and a looser converter...but it was still like a light switch, on/off. Many better cams out there, IMO.