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351 isn't a big block. As for an answer to your question, depends on which inline six... tractor-trailer engines are inline six engines... If you're comparing the 300 Ford I6 to the Ford 351, the 351 has more power, hands down.

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Q: Which one has more power stright 6 or 351c big block?
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Is the Ford V8 351 a small block or big block?

It depends. There is a 351 Windsor, a small block, a 351 Cleveland, a small block, and a 351 Modified, which is a strange mix of big and small block features. These are referred to as 351W, 351C, and 351M, respectively. The 351W looks just like a 302, only it's a couple inches wider. The 351C has a smaller block than a 351W, but much wider cylinder heads than the 351W. The 351C was offered in both 2 barrel and 4 barrel versions. The 2 b heads had ports a bit bigger than the 302/351W, but the 4b heads had HUGE ports. The Cleveland, although it's quite wide, is still very much a small block. (the block isn't much bigger than a 302's block) And then the 351M.. I refer to these as 351"Mutant", even though the M really means "Modified". This strange 351 has a hellhousing pattern and engine mounts that are interchangeable with 429/460 big blocks, but heads very similar to 351C 2barrel. The block itself is roughly the same dimensions as a 351W. It's more small block than big block, but a lot of guys refer to it as a medium block. Whatever. I just call them Mutants. And there you have it. A real quick way to check is to look at the number of bolts holding down the valve cover. Eight indicates 351C or 351M, Six indicates 351W. Also, 351W valve covers are flat and have a rectangular profile, while 351C and 351M usually have a trapezoidal profile. They never offered the 351C in a truck in the US, only the 351M/(and 400 - a stroked version of the 351M)


Will the motor mounts from a 351 Cleveland work with a 351 windsor?

Yes. There are many major differences between the 351W and 351C, but mounting and bellhousings are generally interchangeable. Differences include water pump and water routing through the block, timing chain cover, the 351W crankshaft has significantly larger bearings (3 inch mains), the 351W had non-canted wedge heads while the 351C has canted valve heads with different water outlets (they will interchange with suitable special aftermarket intake manifolds), block deck heights, and so on. While the 351C was initially favored as a high performance engine, the valves and ports were later found to be too large even for high performance applications. The current NASCAR heads have less valve cant, smaller chambers, and smaller ports with higher velocity than standard 351C heads had. For most applications like trucks or passanger cars, the 351W is a vastly superior engine with better fuel economy and more torque and power. A swap from a 351C to a 351W is a good modification for a street engine, or even a high performance engine.


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