Kelford Cams have been producing high quality racing camshafts since 1968 .The latest racing cams are CNC ground using ultra modern design programs. Kelford have been working on a few camshaft profiles for the VR38. The 231-A grind is a lower lift and duration that can use the factory springs. The 231-B has a more aggressive lift and duration that requires a valve spring change.
The aggressive cam has 276 degrees of duration intake and exhaust with 11.25 mm of lift inlet, and 11.22 mm of lift on the exhaust side.
Stock VR38's have 238 degrees of duration with 9.56 mm lift intake , and 248 degrees of duration, with 9.88 mm of lift on the exhaust.
GT-R performance parts