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High Compression Head, I think Not

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  • High Compression Head, I think Not

    I wonder what makes this seller think this is a high compression head?

    https://www.ebay.com/itm/Model-A-For....c100033.m2042

  • #2
    Enough carbon deposits to bump it up to 4.3? I wonder why Model A people think 6.0 is high compression? My lawn mower is 7.5:1.
    Mechanical engineering 101: If you put an adjustment knob, screw, bolt, or tolerance specs on something, some people will immediately fiddle with it. If you mark it DO NOT TOUCH everyone will mess with it.

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    • BNCHIEF
      BNCHIEF commented
      Editing a comment
      Because it says so in the vendor catalogs, but that really is not the case as you say.

  • #3
    Tom, I didn't know most of mine must be high compression ! They look just like that one Pat
    Model A's and of course the famous AA's

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    • #4
      Silly, the guy was high when he did a compression test

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      • #5
        The compression was so high it push backward on the water pump impellor shaft and wore deep into the web in the head.
        Oh wait, original 4.2 heads did that all the time......and we all use a collar to stop that now. OK, I give, it is hi-comp because he says so
        LOL good find, Tom, so when are you gonna install it?

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        • #6
          Originally posted by tbirdtbird View Post
          The compression was so high it push backward on the water pump impellor shaft and wore deep into the web in the head.
          Oh wait, original 4.2 heads did that all the time......and we all use a collar to stop that now. OK, I give, it is hi-comp because he says so
          LOL good find, Tom, so when are you gonna install it?
          Not me, I bought the 5.5 head from Bert's when I stopped there about 10 years ago. Still haven't installed it yet though.
          Time to make another trip to Bert's to check out his new location.

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          • #7
            His new place is set up real nice Tom.

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            • #8
              Looks like a common $15 take a chance head. Rod
              "Much of the social history of the Western world, over the past three decades, has been a history of replacing what worked with what sounded good." Thomas Sowell

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