The factory had the cam retarded 5 crankshaft degrees on all the big Healeys. Offset keys are required when grinding a performance cam. NITRIDING IS STRONGLY RECOMMENDED OH ALL AUSTIN HEALY PERFORMANCE GRINDS. ROCKER ARM RATIO= 1.45:1 (AVG.)

Longer duration cams are available for all-out racing applications. The edge of the cylinder may need to be relieved for the valve to block clearance with cam lifts of 290 or greater. Nitriding (heat treatment) is required on all but stock grinds.
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