I was wondering where to look on my 78' ford F250'.s block to find out what i have. Also if i find letters/numbers, what do they mean?

 

I'm assuming that the engine is not original to the chassis, hence invalidating the rating plate and the certification label; and there is no identification label on the rocker cover of the engine. All three of these would identify the engine if they were there and valid.

 

As the old saying goes, welcome to FTE.

The 351W and 351C did not come stock in 73-79 trucks. Some of them have been "transplanted".

Engine Identification:

351C/M/400 335 series: 8 bolts in rectangular valve covers. Timing chain housing is part of block. Thermostat housing on block. Exhaust bolt holes diagonal.

351M/400 335 series: intake is 12.7" wide the 351C is narrow. The 351M and 400 are identical externally, only internal parts examination (measure the stroke with a wooden dowel rod) can tell them apart.

351W/302/5.0L 6 bolts on trapezoidal valve covers. Thermostat housing on intake. Exhaust bolt holes horizontal.

429/460 385 series: 7 bolts in rectangular valve cover

352/360/390/427/428 FE series: Intake goes under valve covers.

Look for a tag on the dvrs side valve cover. Might have the eng size.