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Nah, they should be fine! :LOL: All you have to do is hone them out for bigger valves, bore out the bolt holes, and pray! A lot. The 305 was yet another emissions engine. Why did the US have to make...

Holy crap, your right. What would happen f he shaved .20 off the heads, that would put him in the 65-60cc range-right? and that should be fairly cheap.

Acually, if all of them are specified for this engine, It would all seem to be compatabe, except maybe for the intake and carb. Ive seen a few holldey intakes not like other carbs, but that can be...