348 Valve seating and clearances | FerrariChat
Buy

348 Valve seating and clearances

Discussion in '348/355' started by MaterMech, Jun 29, 2007.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, Skimlinks, and others.

  1. MaterMech

    MaterMech Formula Junior

    Feb 26, 2007
    476
    Los Gatos CA
    Full Name:
    Mark Johnson
    #1 MaterMech, Jun 29, 2007
    Well after the valve job there are a few valves that are out of spec +/- a couple of thousansths of an inch. I let the machine shop butt grind the valves so they are very close to spec. I want to let the valves seat properly before I make any adjustment. Intuition and experience tells me that it shoud be ok to run for a while like this before shimming. What do you guys think?
     
  2. ernie

    ernie Two Time F1 World Champ
    Lifetime Rossa Owner

    Nov 19, 2001
    22,620
    The Brickyard
    Full Name:
    The Bad Guy
    #2 ernie, Jun 29, 2007
    I say shim them on the loose side of the specs. That way you leave some room for them to tighten up.
     
  3. gothspeed

    gothspeed F1 World Champ

    May 26, 2006
    10,244
    U.S.A.
    Full Name:
    goth
    #3 gothspeed, Jun 29, 2007
    +1 the valves will settle slightly into their seats and heat will expand the valve stem length. So err on the looser side ;)
     
  4. No Doubt

    No Doubt Seven Time F1 World Champ

    May 21, 2005
    72,740
    Vegas+Alabama
    Full Name:
    Mr. Sideways
    #4 No Doubt, Jun 29, 2007
    I did not know that. Thanks Goth and Ernie!
     

Share This Page