1992 Scab 4x4 with 351 5.8l. Originally truck had 302, previous owner got a crate longblock 351. just wondering how i can tell which 351 it is. cleveland, windsor or modified? I want to get gasket set and valve covers and want to make sure i have the right animal

 

I am going to take a WILD guess and say it is a windsor. When you get the covers off, I do know there is an "M" stamped on the (I MAY BE WRONG) upper left corner on the head. But, if I am "GUESSING" correctly, they changed a small block (302) for a small block (351). An "M" has a 400 block if I remember correctly. And I am not certain enough to tell you anything about the "C".

I am sure I will be corrected or agreed with.

Hope this helps.

 

its a Windsor if its efi. Cleveland's were only made in 70-74 so its very unlikely it one of those. M's (no such thing as a "Modified") have the upper radiator hose in the block along with Cleveland's. Not in the intake like Windsor's. they also have 8 valve cover bolts W' only have 6 Most likely its a Windsor."M" 351's were discontinued in the early 80's so its very unlikely its on of those either.

 

There was also a 69 351C. Are you sure there was not a 351M or was it only the 400s? I thought the 351 two barrels were 351M. The clevelands and M's have much wider heads and water does not flow thru the intake.

 

No, the 351c was first delivered in 70. Perhaps your thinking of the Boss 302 that used Cleveland heads on a Windsor block in 69 but there was no 351C in 69. 351M's and 400's are the same block. Both were discontinued in 82 I think. 351M may have been killed before that.

 

oh no, I know the difference in a Boss. I ran a 351C 4V for years as a drag race engine in the 54 Ford truck in my gallery. I was almost certain that the 351C was an option in some of the Mach Is and the Cyclones. Maybe it was 70 and 71. But, I can almost picture part numbers on heads that started with the code for 1969. (C9)

 

well considering its in a 90s f150 i would say its a windsor because they rarely even made anything for the clevland that would fit in the truck frame itself. i know this because my uncle gave me a 351 clevland for my 95 and i cwould have had to get headers made to fit in the truck because the blocks are different, and if it was a clevland in your truck it would have to have a 400 truck block.

 

I have a 71 mach I with a 351c and while I claim not to be a Cleveland "expert" I know for sure it was manufactured 70-74 and that was all. (except in Australia were it was made until about 82) They came late in 70 and thats why some 70 mustangs have Windsors and the later ones have Cleveland's. There were no 351w's in 71-73 mustangs. It was supposed to replace the 351W but it was a hard motor to get passed the new EPA regulations. Ford can cancelled it in 74. It is however superior to the Windsor.. The 351M 400 is the simular block design as the Cleveland but they had the large block bell housing..

 

It all started out with the 351C, then they made the block taller with a bigger crank to get the 400, then they Modified (that is where the M comes from) a 400 with a shorter crank to get the 351M, it came out quite abit later and I think after the 351C had died in 1974. The C and the M may have ran beside each other for a few years. 351M's were gutless in a truck but ran forever, 400's with their huge 4" stroke could almost run with a 460 of the same era, and are a very tough engine. Aside from a very few engines the 351M/400 also had a big block bellhousing bolt pattern, both engines were discontinued after 1982.

All that aside I would put my money on it being a 351W in that new of a truck.

 

I loved the Clev in my truck. It could make that old F100 really haul even given how heavy it was and how difficult to get traction. I ran a Holley 800 double pumper, pretty big cam, Holley intake, 4.88 gears, a built C4 and a 150 Nitrious system. Best time was a 12.98. Had lots of times in the low 13s. I loved outrunning the big block Chevys with it, since most of them got a little hacked.

 

"M" was only to seperate it from W & C 351's. NEVER has ford called them Modified or Midland or anything else. There has never been a 400M 400 Modified either. only 400.

 

Many would begg to differ with you about that.

351 M has a shorter stroke than a 400. But, they do use the same block.

Oh, well. To each their own!

 

Clevelands dominated the 70's and 80's. There head design was 25 years ahead of the competition. it was only the cheap aluminum heads in the 90's that gave the SBC's and Windsor motors the ability to catch up. My Mach I had 11-1 compression and 300 hp STOCK..

 

They can differ all they want but can they prove it? Ford has never used the term "modified" in any company publication. If it exist I'd love to see it..

 

ol wow this thread took off...YAY ME!!..lol, yeah it is EFI and it is longblock, so i am probably going to say it is a windsor, but i did learn alot about the other models..thanks