quote Drifter:
The bad casting (7.5hp) measures 0.782″ and the replacement I used measure 0.745″. Can someone tell me what the proper size is for a 7.5hp?
5.5 horse carb throats should measure 3/4" (.750 +/-) at the butterfly end and 7.5 carbs are a little larger at 13/16" (.812 +/_), I think. Your ’56 7.5 carb should have two humps cast into it at the butterfly end with no holes in them while a 5.5 carb will have holes in the humps for the cam follower to pass thru. The 7.5 motors use a different linkage system with the cam follower fastened to the intake manifold.
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