Web Cam Type 1 Split Duration Camshaft, Grind 121/125, 00-572 is a Broad Powerband cam, with .490/.478" Valve Lift with 1.1 Rockers, 298/288 degrees of advertised duration, and 271/260 degrees of duration at .050" checking clearance.The Split Duration of this cam was engineered for the most power possible for Big Engines with 1.1 Ratio Rocker Arms.
This is a cam that is not going to last 40k miles, it's specialty is reserved for Weekend Warrior Status. Great Sand Dune or Hot Street cam for guys that do not have the scratch for Ratio Rockers!
This cam pulls from 2500-6500 RPMs and dual 2bbls of carbs and extensive porting and headwork are required! This cam works great on a 105 Lobe Center!
Lobe Center: The proper term is really "Lobe Separation Angle", but people more recognize "Lobe Center" so that's the term we have used here. Lobe Center is a VERY complex topic, generally speaking a smaller (Narrower) Lobe Center will improve low end power at the expense of top end, and a Wider Lobe Center will do the opposite. Of course, duration does the same (more duration helps top end at the expense of low end), but it's just another way to further refine your power. If you do not know what Lobe Center to choose, the VW Standard is "108 Degrees" and you won't go wrong with that (if you didn't know, we would send you "108 Lobe Center").
We offer a range of Lobe Center options for guys that have researched the topic thoroughly, and want to order a cam with a specialty configuration.
CAM CLEARANCING: Select the Cam Clearancing option for stroker crank on long stroke engines! It's needed on all 82mm or longer strokes, and SOME 78+mm crank/rod combos (VW or Porsche journals). It depends on the size of the big end of the connecting rod, but USUALLY the bigger the rod journal the bigger the big end of the rod. Generally speaking H-beam rods have a smaller "Big End" than I-beam rods do, but the only way to know is to check. If you aren't sure, just pay up for the "Cam Clearancing" option for the most room on your engine build.