What is the difference between a 1978 head and a 1980 head

[zoom2001]

Other than the carb intakes? Also are the cams interchangable? For A GS550.

[MisterCinders]

The alpha sports parts look up suggests that they are the same. You should verify every part though.



12711-47000 is the 1978 Intake Shaft

12721-47000 is the 1978 Exhaust Shaft

The intake shaft has the same part no. for 1978 and 1980. But the exhaust shaft does not. Didn't check the sprockets, but you need to do that too. They may have different tooth counts across model years.

[hampshirehog]

The cams do swap over. There is a difference between the years. My memory must be failing as I thought inlet and exhausts were different but from Mistercinder's post I guess it's just the latter. Anyway, they are interchangeable as I've swapped loads around over the years to the point of losing track which was which.