Would it be a good idea to use slightly larger valves, to replace OEM 1950s valves?

wzWHIZZER

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Mar 7, 2019
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1950s vintage H engine Whizzer. OEM valves are whimpy, about 1/2" across. Why not install newer slightly larger valves? Is stem diamter of vintage 1950s H engine valves same as new generation Whizzer valves?
 
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