Hudson valves

barrysweet52
barrysweet52 Expert Adviser
in HUDSON
I have bought some NOS valves for my 37 Terra. C711, S711, DC711 and DEC D239. The first 2 mentioned are I believe Dufor and I believe the last 2 listed are Dreadnought. It would be good to know if they were inlet or exhaust valves. Can anyone help pls. Thanks 

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  • Frankvintagefullflowcom
    Frankvintagefullflowcom Senior Contributor
    edited December 2016

    I believe both valve head diameters for the sixes is the same @ 1-3/8 so that's not an indicator but, since the stem diameter controls the stem-to-guide clearance and the guides have the same ID, the exhausts will have a stem diameter of .339" and the intakes, .341", yielding .002" more clearance for the exhausts.

    F 

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