Need some help with telling my 351 block is a cleveland or windsor, the guy SAID it was a boss 351C but i am doubting. i could care less which one it is but i am going to sell the shortblock and i want to make sure which one it is. casting code- C90E-6015-A Can you tell if its a cleveland buy the casting code? all i can tell that its a 1969 351 out of a fairlane or torino. On top of the block though by the lifters it has 351 WF, which makes me think the "WF" means its a windsor. also has 2 bolt mains if that helps. thanks, nick.
I am not aware of any Cleveland engines with a C9... casting number. The earliest ones would be D0.... Cleveland engines have the water neck in the block, because the intake manifolds have zero water passages. I think that you are correct with the "WF" Pretty sure it is "Windsor Foundry".
If it looks like a wide 302 it's a Windsor... If it has the water outlet in the top of the block(not in intake), a cast on timing cover with vertical pattern fuel pump mount, it's a Cleveland...
The 351 Windsor has a bolt on aluminum timing cover that looks just like the one on a 302. In fact, a 351W looks just like a 289/302 but has a taller deck height. A 351 Cleveland has a flat steel plate that bolts to the front of the block and the timing cover area is cast as part of the block. 351W has 6 valve cover bolts and a 351C has 8 valve cover bolts. Quickest way to tell. If it's a 351W it isn't a Boss of any kind. SPark
Boss was the name given to the Hi-Po Cleveland version used in 1971 Boss Stangs, most of the components are same as regular Cleveland engines...
The Boss 351 had adjustable valve train, a solid lifter cam, an aluminum dual plane intake, different keepers on the valves, pushrod guide plates, a 4 bolt main block and domed forged pistons as the major differences. It was essentially a beefed up and modified Cleveland 4V engine.
Cleveland's were used 1970-74, not much high performance support in the last 20 years, and expensive to build. 351W is the way to go.
Comparing the best vintage 351W(1969, 290Hp) & 351C(1970, 300Hp) it ain't even close, the C will take names and kick butt big time... BUT as mentioned, Cleveland evolution basically ceased in the '70s/early '80s... There were 351M(modified) built from '75-'80 that were basically Clevelands in the taller 400 block(almost as large as a 460) but those weren't really high perf engines... Still with a good set of earlier 351C heads on a M or 400, along with cam, intake & headers they could really rock and are still somewhat popular with the early truck guys...
my dads truck has the 351 m I keep telling him to scrap the truck and pull the motor even though its not a power house it has never let him down. in 10 years all hes had to do to it is put in a timing chain and rebuild the carb. the problem with these motors is they were smoggers so not meant for alot of power
