Jadson valves

6

62pan

Senior Member
Rebuilding a Riley 4 port head and the valves are Jadson F1058. Riley literature says the valves are 1/8 inch oversize Model A with the mushroom style stem. I can not find any or even any cross reference listing for these. Not interested in a modern type valve at this time so can any one help with a reference to a replacement valve or part number.
 
If you want an original type valve your going to have to have it made.
Or get interested in a modern type set up. The modern ones are $10-$15 each and the original type are going to be $80-$100 each.
My 2 cents.
 
Jadson is an old name, probably un-attainable. The 1941 Ford 6 cyl had exhaust valves 1/8" bigger than stock, only 1941. You might try Egge Machine as a source.
 
I looked at the 41 valves. They are 1/2 inch to short. I did find another number and name on one of mine. Thompson S801. Good thing Hershey is in a few weeks.
 
An adjustable tappet can be lengthened by using a bolt in place of the adjuster, and double-nuts to lock them in place. I use modern valves and guides in my 4-port, nobody can see them when it is all assembled.
 
Thanks Jim, on another subject did you convert to top oiling for the rockers or stay with the felt pad? This is for a cast iron head 1935.
 
Mine is a '36. I did convert but if I were to do it again, I would not. I ran a 2-port for several years with the pads and never had a wear problem. 2-ports were easier to oil as they had holes in the covers to squirt thru. My 2-port had been converted to adjustable rocker arms, so the guides were eliminated. The 4-port has worn the push rod guide bushings in the head.
 
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