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Technical Poly 318 Stainless Valves

Discussion in 'The Hokey Ass Message Board' started by vintagetin88, Dec 10, 2017.

  1. vintagetin88
    Joined: Nov 26, 2010
    Posts: 63

    vintagetin88
    Member

    Alright boys and girls.
    Does anyone know where I can find stainless steel exhaust and intake valves for a Chrysler A Poly 318 engine? I'm looking to have harden seats put in and the machine shop is recommending stainless valves. Will LA valves fit?

    Thanks!
     
    chryslerfan55 likes this.
  2. Deuces
    Joined: Nov 3, 2009
    Posts: 18,515

    Deuces
    Member
    from Michigan

    Someone here knows.....
     
  3. sunbeam
    Joined: Oct 22, 2010
    Posts: 4,943

    sunbeam
    Member

    Ferrea but they won't be cheap.
     

  4. vintagetin88
    Joined: Nov 26, 2010
    Posts: 63

    vintagetin88
    Member

    there seems to be a lot of interest in this, but no one has an answer! I guess they don't exist?
     
  5. squirrel
    Joined: Sep 23, 2004
    Posts: 46,695

    squirrel
    Member

    from rock auto, exhaust valve dimensions, 1966 318 (poly)

    4 groove; 1.5630" Head Dia.; 0.3715" Stem Dia.; 4.5390" O.A.L.

    from rock auto, exhaust valve dimensions, 1967 318 (LA)

    4 groove; Chrome plated stem; 1.5000" Head Dia.; 0.3865" Stem Dia.; 5.0020" O.A.L
     
  6. vintagetin88
    Joined: Nov 26, 2010
    Posts: 63

    vintagetin88
    Member

    That's too easy! I guess I can call them and see if they are stainless steel and can handle hardened seats.
     
  7. squirrel
    Joined: Sep 23, 2004
    Posts: 46,695

    squirrel
    Member

    You can use normal exhaust valves with hardened seats, can't you?

    Are you working the engine hard enough/long enough to need hardened seats?
     
    Truckdoctor Andy and sunbeam like this.
  8. swifty
    Joined: Dec 25, 2005
    Posts: 1,698

    swifty
    Member

    I'm running standard valves with hardened seats in my 318 Poly. Have done 29k miles so far with no problems. I must admit I don't punish it as about 70 is the speed limit here and the govt makes sure you don't exceed it with lots of cameras and highway patrol cops.
     
  9. alphabet soup
    Joined: Jan 8, 2011
    Posts: 1,406

    alphabet soup
    ALLIANCE MEMBER

    Check with Richardson Auto Machine (RAM) in Lynchburg Va. He does a lot of Poly stuff. Gene.
     
  10. 35desoto
    Joined: Oct 6, 2009
    Posts: 760

    35desoto
    Member

    The LA engine valves do not cross over to the poly ones - there is an overal lenght diference that stops that idea.
    Plus stainless steel valves are not really needed - the std type valves were very well made and once lapped in properly will last many miles. Ma Mopar produced good parts
     

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