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The simple answer is you need to replace the valve seats. Back in the olden days they used lead to lubricate the seats- newer ones are harder.
I am not sure about where to find bigger valves, if you did fit them you would need new valve seats for sure, and some expensive machining of the head.
Another option is an 8 valve head (if you could find one). They were fitted as stock to some of the later T140s, prior to that there were some made by aftermarket suppliers.
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