The HH uses the normal GY6 series and the cams will fit. The old style GY6 engines were 157QMJ and those with the P prefix were the industrial which most had 2 bolt valve covers but some used the 4 bolt covers. The main difference were they had a taller head with different rocker arm ratio but also the spacing of the head studs measured diagonally center to center was 3-1/8" where as the normal/ original licensed GY6 engine was 3" and used the short head.
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