Volvo RWD 120-130 Forum

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B20 head on B18 block... BAD? 120-130

posted by  someone claiming to be flying-iron on  Wed Sep 22 07:30 CST 2004 [RELATED]


In looking over a 122 I'm considering buying, I discovered that it has a B20 head on a B18 block. I cannot ascertain from the book of work receipts that came with it however if it was bored out to take B20 pistons or not. My feeling is it has not. If this engine has been running like this for a while, could this have caused potential damage in some way?

On another line of thought, how could I discover if it has been bored, short of pulling off the head?







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    B20 head on B18 block... BAD? 120-130

    posted by  jparker3 on  Thu Sep 23 04:34 CST 2004
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    last visit: Tue Jun 9 18:47 CST 2009
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    Damage merely from putting on a B20 head essentially impossible as the CR will be lower than stock and no clearance issues, etc.
    If the performance is OK don't worry.
    Look in the spark plug hole with a light on a stalk that you can put in the CC.
    You should be able to see if the bore on the sides ( front and rear ) matches up with the edges of the combustion chamber.

    John
    V-Performance.com








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    B20 head on B18 block... BAD? 120-130

    uid 5098's pic
    posted by  Sil on  Wed Sep 22 14:45 CST 2004
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    last visit: Fri Oct 24 07:24 CST 2014
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    If the price is right and the car in good shape, I wouldn't let the B20 head keep me from buying it. If, after taking the head off, you find that the pistons are within B18 dimensions, you can always put on a B18 head, which you should be able to pick up, probably, for just the price of shipping.
    Bob S.








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    B20 head on B18 block... BAD? 120-130

    posted by  Phil S. on  Wed Sep 22 07:45 CST 2004
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    last visit: Fri Oct 24 13:18 CST 2014
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    Probably not something that would cause any damage, but would definitely cause poor performance and economy.

    I can't think of a way to tell if the block was bored short of taking the head off and measuring, sorry.








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      B20 head on B18 block... BAD? 120-130

      posted by  Chris Mullet on  Wed Sep 22 10:16 CST 2004
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      last visit: Fri Oct 24 09:08 CST 2014
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      If you wanted to know if it had been bored, maybe there is some sort of fluid displacement test you could do through the spark plug hole ??????







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