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M20 crankcase

Hi is there a difference between the crankcases on early m20 and later m20. I have a barrel and it appears to be narrower at the base

Re: M20 crankcase

At somewhere around 1938 (not sure of the date?) The crankcase was widened to take an extra main bearing and the barrel was widened to include the cooling air gap behind the tappet chest. I think the cylinder head went from 8 to 10 bolts. Ron

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Re: M20 crankcase

Some early military M20s didn't have a sump emptying plug on the underside of the crank cases, not sure when it was added, KM20 or WM20?


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Re: M20 crankcase

Thanks all for the information..

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