Actually krisr, I would think it would be cheaper to have two molds and cast them separately,than it would be to machine each head to the right specs.
The chamber I think is 'deeper' not the seats.The chamber would be closer to the vavle spring seats.Therefore the top of the valves would need to be shorter to match what the valves in the 72 cc heads would be.
johnta1
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John Wallace - johnta1
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