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Norton Commando Cylinder Heads
 

Identification Number

 


Part
Number

 


Capacity


 

Compression Ratio
 

Inlet
Port

 

Remarks

 

RH1 060988 750cc 9.0 : 1 30mm Standard up to 1972
RH2 061427 750cc 10.25 : 1 32mm AMA racer
RH3 063327 750cc 10 : 1 32mm 1972 Combat
RH4 064038 850cc 8.5 : 1 32mm 1973
RH5 064038 750cc 8.9 : 1 32mm 1973 low compression
RH6 064097 750cc 9.3 : 1 32mm 1973
RH7 064845 750cc 10 : 1 32mm 1973 short stroke
RH8 064884 750cc    - 32mm 1973 short stroke race kit
RH9 065013 850cc 10.5 : 1 32mm 1974 high performance
RH10 065062 850cc 8.5 : 1 30mm 1974
A suffix S, e.g. RH6S, indicates a 750cc head fitted with 850cc guides




 


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