Rpm 340 Cyl heads on a 318 !

yellow rose said

I said “IIRC” but in any case that 2.02 valve WILL benefit from itching the bore. It takes about 5 minutes on a flow bench to see that.

A 2.100 valve on a 4.080 bore picked up with a notch.

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This is true! Though I wouldn’t bother doing such work for a street or mild strip engine, these moves fall under the category of all the “Little Things” that add up in the search for HP and/or the edge in racing. Every little bit helps.