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Thread: Which 'O'-ring in fuel inlet valve(s)?

  1. #1

    Default Which 'O'-ring in fuel inlet valve(s)?

    My first post!

    I am rebuilding a 1994 (1850-4) 4160, manual choke, no dashpot.
    Bought a "TricKit", 37-199 and some more stuff:
    Vacuum Secondary Diaphragm, Sets of 65, 63, 61 jets (and the 'old' 66), Set of 7 pump cams,
    A vacuum secondary 'QuickChange' kit and 8 springs, one 2-stage power valve (-208).........
    to experiment with. Want to 'cruise' only, so better MPG would be good......

    Question - My 'old' fuel inlet valve (Ref No. 12 and 57 in the Instruction Sheet) and 'O'-rings
    (Ref No. 13 and 58), both primary and secondary, did not have any 'O'-rings there.
    Should I: Put the new fuel valves in with NO 'O'-rings.........OR.......put in the new 'O'-rings in the kit?

    Bonus - Which 'O'-ring do I use? Have 3 ---- 2 small, 2 medium and 2 larger (fuel line tube, I think...)

    RickO, South Jersey (NJ)
    1967 Chevy Stepside 350/Munice/N2 Bags
    1972 (British) Triumph TR6/Toyota (!) 5spd

  2. #2
    Join Date
    Jan 2013
    Constantine, MI


    I think it's the medium ones Holley #6-81, the small ones are for transfer tube or accelerator tube. If unsure measure the O.D. of the needle (o-ring groove) and I.D. of the o-rings there should be NO slop. Make sure you lube them up before installation.

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