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Define Engine type

(1990 Ford Bronco)
in Oak Harbor, WA on June 02, 2010
Hello, got two 1988 bronco's both have 351 v8's. How Do I discern the 351W from the 351M ? Haynes/Chiltons won't break the VIN down enough to tell me...
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on June 02, 2010
if you look at the vale covers, the winsor motor has thin valve covers and the modified has covers that are twice as wide.

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on June 02, 2010
The 351w was built in windsor Ontareo,Canada,for ford motor company it is the smaller block verson of the Engine desine back in the late 60's to the mid or late 80,s I think.. The 351 m was built in the USA. It was built as an engine that could be modified to have a changeable cubic engine displacement,either a 351 or a 400 cubic in.By using a different crankshaft with a longer stroke,but used a big block engine for both sizes.It was called a 351m-400,on the lable on the valve cover,and was a 400.The 351cid was labled 351 m The 351 Cleavland was built in Cleavland ,Ohio.It was the high performance version in its day.
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on June 02, 2010
Both of mine are 351W. I'm going to keep them stock but adding headers and stainless exhaust.
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