Valves

According to an old James Catalogue, the valve dimensions are as follows.

According to my measurements the valves are somewhat longer.

Anyway I'm not patient enough to wait and see if any JAP valves will pup up so I scanned through some valve makers catalogues and found out that Manley GEN II exhaust valves are pretty close.

Found a set of eight valves for sale on eBay. These were custom made and the valve head was close enough to fit without modifications.

Valve head = 1.6" & Valve stem 7mm

Of course they will have to be shortened and modified with slotted stem ends.

The main concern is if they are too heavy compared to the original ones.

In case they can't be used I'll buy some used NASCAR titanium valves and try to modify them instead ...