I've got a Kohler engine spec question. I've got two 149's. One made in Sept '71 and the second in Dec '72. Both are K321A engines. The older 149 has an obliterated Kohler label, and the newer 149 Kohler label reads Spec 60166d. The engines are slightly different, ie the spark plug is centered on the head of the older 149 and off-center in the newer, and thus they have different cylinder head baffles. Would the older 149 have the same Kohler engine spec as the newer 149? If not, any idea on what is older 149 engine spec?