I.D.ing a 351

[Fireman James]

I have a 351 motor how can you tell if it is a 351W or a 351M??

 

[Jon Hagen]

http://www.vintage-mustang.com/topics/faq/351windsorcleveland.html
351 engine ID

 

[Kruse]

351W will have horizontal fuel pump bolts.
351M will have vertical fuel pump bolts.
(Amoung a few dozen other differences)

 

[mtflat]

Valve cover bolts:
351M/400 uses 8
Windsor uses 6

Cleveland has a dry intake - upper rad hose goes into the block.
Windsor has a wet intake - upper rad hose attaches to the intake manifold.

 

[Fireman James]

thanks for the info.