I think that larger Powerglide 235 valves (1.94" dia. GM #3835519) can be used in any high-pressure 235/261 head.
I have used the larger 1950-52 Power Glide intake valves in the 1953-62 heads several times.
Dave, did going w/the larger valves increase your engines HP and did you do other mods to the 848 head?
I ask as I will be exploreing options to squeeze as much streetable performance as I can out of a 54 235 w/an 848 head.
Dave
