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Can anyone tell me if there is a difference between a set of 1970 351W 2 barrel exhaust mainfolds and a 1970 351W 4 barrel set of exhaust manifolds? Thanks
 

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They are the same. The 4bbl 351W had a slightly higher compression piston (and the 4bbl carb), but was identical to the 2bbl. The heads are the same and so are the exhaust manifolds.
 

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I don't believe that there is such an animal as a "stock" 1970 351W with a 4V. In '69, the 351 Windsor was available with both a 2V or 4V engine option. When the 351 Cleveland was introduced in 1970, that became the only engine supplied when the 4V option was ordered. If a 2V 351 engine option was ordered in '70, it was the luck-of-the-draw as to which engine (Windsor or Cleveland) would be supplied. Both were.

There may be rare exceptions to this, but I haven't seen one. If you have a '70 with a 351 Windsor and a 4 barrel, then it is more likely that someone switched the stock '70 2V intake manifold for a '69 4V manifold. That is what I have done.

David
Mountain Dew & Donuts, because breakfast is the most important meal of the day!
'66 Coupe 289 2V done for son
'70 Coupe 351W 4V (She Bear), doing for me!
 
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