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'74 B20F head- Did they come with hardened seats or not? 140-160

posted by  malloy1 on  Sat Jul 10 10:32 CST 2010
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last visit: Sun Oct 12 17:44 CST 2014
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I just picked up a '74 B20F head from a 144GL today. I thought they came with hardened valve seats starting in '74. Cleaned some of the carbon up on the exhaust valves, but didn't see any seats. Am I wrong?

Paul








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    '74 B20F head- Did they come with hardened seats or not? 140-160

    posted by  Charlie142 on  Sun Jul 11 14:44 CST 2010
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    last visit: Sat Jul 23 15:38 CST 2011
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    The B-20 heads with hard seat inserts from the factory are pretty rare. You are more likely to find one on a 1975 B 20 fitted to an early 240. I consider them desirable because the factory seats fit the valve bowls much nicer than any machine shop installed seats that I've seen.








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      '74 B20F head- Did they come with hardened seats or not? 140-160

      posted by  malloy1 on  Sun Jul 11 17:36 CST 2010
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      Still a very nice head I got for $40. Engine had a worn cam.

      Wished it had the seats in it already.

      Paul








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    '74 B20F head- Did they come with hardened seats or not? 140-160

    posted by  planetman on  Sat Jul 10 11:16 CST 2010
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    last visit: Fri Oct 24 09:29 CST 2014
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    Hello,

    Probably not as unleaded fuel was introduced for the 1975 year model, IIRC.

    The seats WERE flamed hardened at the factory for 1975 engines.

    The flame hardening only treats a very thin layer of the cast iron.

    If the head has every had a valve job, the hardened area is probably gone.

    I almost always have hardened seats installed for my customers cylinder head rebuilds.

    The only exception being that new seats were already installed or if we are machining for larger valves usually for a performance engine.
    --
    Eric
    Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
    Torrance, CA 90502







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