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Be advised that you just can't put bigger valves in.

2.19-2.25-2.30" are the popular oversizes. The valve pocket and seat need to be cut open for these valves. It is best done by a shop with a Serdi type profile cutter and various bowl cutters.

Same goes for the exhaust. A 1.88" exhaust valve with a well done profile cut will greatly improve flow=horsepower.
 
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