351m switch
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Senior User
Joined: Mar 2004
Posts: 198
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From: Rocky Point, North Carol
351m switch
I have a 77 F-150, and I'm trying to get a workable engine to go in it. I pulled a 351m out that had a slagged crank and horribly pitted cylinders, so I want to drop a different engine in. A friend of mine donated what he said was a 400, but the bell housing bolts are a different pattern, and the crank is noticeably larger than my 351. I am trying to figure out 2 things:
1. What size is the "400" if it doesn't match up w/ the 351m?
2. What other engines will fit the bell housing and mounts for the 351m?
I considered a cleveland or maybe even a 300 straight 6?
1. What size is the "400" if it doesn't match up w/ the 351m?
2. What other engines will fit the bell housing and mounts for the 351m?
I considered a cleveland or maybe even a 300 straight 6?
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
First identify your engines:
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 10.7" wide the 351C is narrow.
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.
There are other indicators but these may help.
Once you have done that we can help you. The 351M and the 400 are identical from the outside.
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 10.7" wide the 351C is narrow.
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.
There are other indicators but these may help.
Once you have done that we can help you. The 351M and the 400 are identical from the outside.
