Newby here....
This may be a dumb question but.. I just bought a 97 F250 HD with a 351 EFI.... Ok, I had a 77 F150 with a 351m.. Who makes my newer 351? Is it a W?

Another ?.... What are these newer 351's Rated at as far as horsepower stock?

Thanks
Tom

 

The 97 is a W.

I'll bet it has provisions for roller cam. The block casting number should reveal if it is.

 

Thanks, when did they do away with the "C" and the "M"?

 

he C ended in 74. The M ended in 80, but they installed a few in Bronco's and F250 and F350 until 82. Not many though. http://www.projectbronco.com/History..._ford_351m.htm