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Re: I would look at larger intake valves.
On Jack Laverty's EG33, we went with .5 mm oversized Supertech valves, since they were a no-cost upgrade option. I would have prefered at least 1 mm oversize (intake and exhaust).
However, given the weakness of the exhaust flow compared to the intake flow, I would rather use stock intake valve diameters, and go much larger on the exhaust valves (2 mm is not out of the question IMO). I feel there's a bit more power to be had this way.
The exhaust side was only flowing about 65-70% of the intakes (the straight ports outflow the dogleg ports), and that was after a lot of porting work on the exhaust ports. Intakes were barely touched by comparison.
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