streetdreams
Well-known member
I've always wondered, what does the "M" in 351M mean?
Tuning For Speed-Major Tuning (Blueprinting)
- Thread starter all american boy
- Start date
miker98038
Well-known member
“M” for modified is what I remember, but I never knew “modified” from what. We had a number of 351M and 400M smog motors in the fleet, mainly 1 ton vans. I had a couple personally, also. I’ve got to agree with Sal, they were one of the worst power and mileage engines I ever had. Back in those days, we just replaced them with 428’s (which were still around in the junkyards) if it looked like a torch would make them fit.
KULTULZ
Well-known member
M identifies the tall deck 351CI 335 SERIES from the 351W and 351C. It was a de-stroked 400.
The 351C was dropped for the 1975 model run as was the FE LT. The 400 was de-stroked to give an engine size that would replace the 351C and FE 360.
It saved FORD $$$ as they went from three engines to one basic block.
It was also called the MIDLAND but MODIFIED is the more common description.
The 351C was dropped for the 1975 model run as was the FE LT. The 400 was de-stroked to give an engine size that would replace the 351C and FE 360.
It saved FORD $$$ as they went from three engines to one basic block.
It was also called the MIDLAND but MODIFIED is the more common description.
Ford did some interesting mix 'n match with these engines. The 351W and 351C had the same bellhousing bolt pattern as the 221, 260, 289 and 302. The 351M and 400 have the same bellhousing bolt pattern as the 429 and 460. The 221, 260, 289, 302, 351W, 351C, 351M and 400 all have the same bore spacing and head bolt pattern. So a 400 head will bolt onto a 221 block, and vice versa. 289 through 400 all had 4" bores.