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Flathead Valves 1.5 vrs 1.6

Discussion in 'The Hokey Ass Message Board' started by 87Heaven, Jan 10, 2011.

  1. 87Heaven
    Joined: Dec 20, 2009
    Posts: 71


    My question is,

    Is there any benifit to running oversize valves on my 8BA block?
    Stock 1.5" vrs chevy type 1.6".
    Block is at the macine shop and I need to make a decision.
    I would really like to hear your opinion?

    Thanks guys
  2. lowsquire
    Joined: Feb 21, 2002
    Posts: 2,567

    from Austin, TX

    there is probably not a real noticable difference in a street engine, but the chev valves are a good thing I can get nice stainless undercut ones pretty cheap. they are usually a tad longer than originals, so adjustable lifters are needed to fix that. its a cost thing mainly. If your engine has seat inserts already and they are in good condition they should be able to accept being enlarged for the 1.6s easy.
  3. Flat Ernie
    Joined: Jun 5, 2002
    Posts: 8,406

    Flat Ernie
    Tech Editor

    Stock-ish rebuild - no point.
    Performance rebuild - useful with reground cam 1.6 intake, 1.5 exhaust (chevy) as they're about .100" longer or so.
    Hi-performance build - the increase in flow is worthwhile and 1.6I/1.6E should be
  4. mt shasta steve
    Joined: Mar 26, 2010
    Posts: 270

    mt shasta steve

    I put Cheby exhaust valves in a V12 about 25 years ago. Worked slick, the biggest advantage is larger diameter valve stems. You drill under size, then ream to proper clearance. Gives you basically new valve guides.

  5. 87Heaven
    Joined: Dec 20, 2009
    Posts: 71


    Thanks Guys,

    I ordered the tru flow 1.6's from Reds Headers today.

    A little more money than stock chevy stainless valves but I don't have to worry about the extra length and possibly extra shims under the springs.

    My machinist is going to install larger seats for these valves also.

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