ID Engine
Laughing Gas
Joined: Oct 2015
Posts: 992
Likes: 114
From: Dallas, OR
The engine code is in the VIN or on the warranty plate. May or may not be accurate 40 years later under the tender loving care of previous owners. If it's not a 460, it should be 351M or 400. They are identical on the exterior with the only way to tell for sure is to measure the stroke. Either should have 8 bolts on each valve cover.
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Cargo Master
Joined: Aug 2004
Posts: 3,455
Likes: 8
From: Williams Lake B.C.
The engine code is in the VIN or on the warranty plate. May or may not be accurate 40 years later under the tender loving care of previous owners. If it's not a 460, it should be 351M or 400. They are identical on the exterior with the only way to tell for sure is to measure the stroke. Either should have 8 bolts on each valve cover.
I wanted to know if there was a visual way to tell apart.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 787
From: Simi Valley, CA
1977/79 F250 4WD: 4th digit of the VIN is the engine code: H = 351M / S = 400.
1977/79 F100/350 & 1978/79 Bronco 351M/400 block casting number: D7TE-6015-A2B
Regular User
Joined: Sep 2014
Posts: 1,798
Likes: 15
From: Bathurst, New Brunswick
Found this in another thread:
Engine Identification (rev):
======================
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.
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 are enough to distinguish engine families.
Engine Identification (rev):
======================
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.
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 are enough to distinguish engine families.
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