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Old 09-20-2018, 01:14 PM   #1
62pan
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Default Jadson valves

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.
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Old 09-20-2018, 02:27 PM   #2
1931 flamingo
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Default Re: Jadson valves

Try Charlie Yapp (?) at Secrets of Speed.
Paul in CT
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Old 09-20-2018, 05:33 PM   #3
Dodge
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Default Re: Jadson valves

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.
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Old 09-21-2018, 10:32 AM   #4
Jim Brierley
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Default Re: Jadson valves

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.
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Old 09-21-2018, 02:28 PM   #5
62pan
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Default Re: Jadson valves

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.
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Old 09-21-2018, 04:52 PM   #6
Bob C
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Default Re: Jadson valves

Looked in my Thompson catalog and S801 is 1/8" OS for Model A & B STD. is S800.


Bob
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Old 09-21-2018, 06:04 PM   #7
62pan
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Default Re: Jadson valves

Thanks Bob
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Old 09-22-2018, 08:47 AM   #8
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Default Re: Jadson valves

Also,
look into "Lash Caps"
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Old 09-22-2018, 10:59 AM   #9
Jim Brierley
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Default Re: Jadson valves

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.
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Old 09-23-2018, 07:40 AM   #10
62pan
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Default Re: Jadson valves

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.
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Old 09-23-2018, 11:17 AM   #11
Jim Brierley
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Default Re: Jadson valves

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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Old 09-23-2018, 02:35 PM   #12
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Default Re: Jadson valves

Thanks Jim, I was thinking of staying with just the pads, your answer helped me a lot.
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