Will an exhaust manifold from a 351M fit a 302? I have a 1977 F-100 with the 302 and I need to replace the manifold. Thanks!

 

No, it won't.

 

Thanks! Is it because it's a different bolt position, larger ports, or what? I am trying to gain more knowledge about these trucks.

 

Its a different engine family altogether, the 351 W is the same family as the 302

 

So, I take it this means that I can use the manifold off of a 351 W, then? I don't know if it is off of a 351M. The sticker on the valve cover just said 351. The manifold looks the same as the one on my 302, but I guess it means that it won't work? The manifold came out of a 1977 F150 with the 351, if that helps.

 

The 351 windsor looks like a slightly wider version of the 302. The 351M is a completely different engine. There are several ways to tell which you have.
The number of bolts on the valve cover is different but I don't recall off hand how many each cover has.
The thermostat housing on the 351W bolts to the front of the intake manifold and points up at roughly a 45 deg. angle. On the 351 M it bolts to the block and points straight up.
The fuel pump on the 351W bolts to the block with two bolts at the 3:00 and 9:00 o'clock positions the 351M has the two bolts verticle at the 12:00 and 6:00 o'clock positions.
I'm not sure whether a 351W manifold will fit or not but I do know for sure that a 351M won't work.

 

Okay. I just figured that it would since the design of the manifold looks the same, but I'm new to Fords. Does anyone know what the difference is between the exhaust manifolds?