Shim Under bucket, High lift Rally Cams to suit racing 4AGE 16V engines with big valves, increased compression and well designed intake and exhaust system. Good mid-high rpm power. 'HV' high velocity cam profile, more cam sweep area than the stock shim will allow. Must convert to shimless or shim under bucket style lifter.

• Kelford Cams recommends KVS101-BT valve spring.