Question about Ford Bronco
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Posted on Jan 02, 2017
The 400 engine was made starting in 1971 and the 351M was made starting in 1975. The 400 engine had a higher deck height so its intake manifold was wider and deeper than the 351 series. This was the result of the longer stroke in the 400 engine and where it gained the 50 cubic inches over the 351.
The heads are interchangeable with the difference being a slight difference in combustion area of the 2 barrel head, but of no difference in mounting the heads. I would think the valve covers should work for you You may just want to lay the valve cover gasket over the old valve covers to assure yourself they will fit.
Because of additional pollution restrictions the 400 series was changed to the 351C which used the stronger 400 crank and pistons but reduced the stroke back to the original 351. At that point the 351C and 351M were both made in Ceveland but the 351C carried the stronger parts. The M designation was to indicate a Michigan Casting motor, the M was manufacturered in 2 places and the 351C was made only in Cleveland.
The EGR is a power robber and soot creator. You do need Pollution equipment in some states. But if you live in a state where you don't, check the internet for kits to do away with it. Some intake manifolds need the "PORTS" to get exhaust flow to circulate gases for the EGR. Some Pollution equipment had "Air Pumps" to blend with the exhaust gases. I hope this helps you.
Posted on Jan 30, 2010
Testimonial: "Thanks for some straight answers. It was just odd to see the 351C seal on the valve covers only to find out it is as 400. Why didn't Ford say 400?"
SOURCE: vacuum lines diagram 351m
Posted on Apr 12, 2011
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