Web Cam Type 1 Split Duration Camshaft Grind 109/119 00-442 is designed for 1/2 1600 Class Cars, and it's specs are .465/.422" Valve Lift with 1.1 Rockers, 287/276 degrees of advertised duration, and 260/240 degrees of duration at .050" checking clearance.This cam has additional Top End Power over the Web 110/163.
The Split Duration of this cam was engineered to optimize the power output of Class 1/2 1600 off road racers with RESTRICTOR PLATES. Restrictor plates and/or limited carburation means the engine has a tough time breathing. They never limit the exhaust! By increasing intake's lift/duration and keep the exhaust mild, it extends power while minimizing overlap (losing low end). The intake is what needs help on these engines, not the exhaust, so that's what these cams are designed for!
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 is a "safe" choice.
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.