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B20E combustion chamber volumes 140-160 1971

posted by  derek uk on  Thu Oct 9 01:39 CST 2008
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last visit: Fri Oct 24 12:33 CST 2014
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In theory of course they all should be the same but I suspect you won't notice anything with the engine running. Finding out why they are different might allow you to balance them up a bit. I'd suspect that the seat inserts are in slightly different positions and you can check the head face to valve centre measurements to find out but a straight edge across the the valve stems would give you a quick check. It's hard to make 4 similar combustion chamber shapes that give equal firing efficiency and flow, while keeping the cc of the chambers the same.






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