Inliners International Forums General Discussion Hi Performance Building a 302 GMC for LSR

Its been known for many years by those that are in the profession of head porting and other areas, that surfaces with an airplane wing edge, that is blunted or ellipsed, creates much less turbulence than a sharp leading edge does in terms of airflow. That mistake is also many times done with knife-edging crankshafts. When a sharp leading edge is ground on the edge of the counterweights. Crower was one of the first to change to the "airplane" wing technology for their crankshafts leading edge almost 20 years ago. For years, people were taking the term literally when speaking of knife-edging, and finally discovered it created almost as much turbulence as the flat edge of the crank did before it was ground on. Sissell/Kirby was and is the leader in siamese port development,also creating the "lump" port technology for the 250' and 292's. Brian and Glen Self are very close behind, and still currently dominate most racing bodies that involve those engines!