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SWMBO's coupe has 64 heads. Feb and Mar casting dates. Anyone know when the valve size change was? I have a matching date code 66 that I'm going to rebuild to swap out. Just wondering about the 64's before tear down. BTW: one of the PO's had installed rail rockers on these slot heads. I have always heard that is a no-no. The rockers make an angle from the push rod to the valve stem, is that why?
 

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I'm not sure about the valve sizes, I'm on vacation and not near my reference stuff. But if you're redoing the heads anyway, I'd put in the 1.84/1.54 valves and do some mild porting. If you have the slotted pushrod holes just make sure to use the proper rocker arms and valve length. Or put in some screw in studs and some roller tip rockers.
 
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