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M-Block 351M/400
Parts Reference
Internal Engine
Parts
Copyright © 2002-2003 Dave Resch
All rights reserved.
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This section lists Ford part numbers and casting ID codes for
the following
internal parts of M-block (351M/400) engines:
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Camshafts
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Cam timing sets
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Valve train
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Pistons, pins, and connecting rods
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Oil pump and pickup tubes
Crankshaft part numbers and casting ID codes are listed in the
Cast Iron Parts
section.
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Check out
this section
if you are not familiar with Ford part numbers and ID codes.
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Camshafts
Ford used at least five different camshafts in production
M-block
engines from 1971 to 1982. The following table lists M-block
camshaft
part numbers and vehicle applications.
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Model Year
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Part Number
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Notes
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1971-1973
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D1AE-6250-A
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Original 400 car camshaft.
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1974,
1977-1979
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D4AE-6250-A
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'74 400 car, all '77-'78 351M/400 truck, '79 400 HD truck.
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1975-1979
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D4AE-6250-B
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All '75-'79 351M car, '78 351M Bronco, '79 351M HD truck.
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1975-1979
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D5AE-6250-A
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All '75-'79 400 car.
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1979-1982
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D9TE-6250-A
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All '79 351M/400 LD truck, '80-up 351M/400 truck.
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The following table lists M-block camshaft specifications.
Valve events and duration are specified at 0.004" on
opening ramps and 0.006" on closing ramps.
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Camshaft
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Duration
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Gross Lift
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Valve Event Timing
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D1AE-6250-A
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256/272
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0.422/0.427
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Intake: 17BTC/59ABC
Exhaust: 71BBC/21ATC
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D4AE-6250-A
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250/272
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0.428/0.433
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Intake: 17BTC/53ABC
Exhaust: 65BBC/27ATC
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D4AE-6250-B
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258/266
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0.406/0.406
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Intake: 19.5BTC/58.5ABC
Exhaust: 58.5BBC/27.5ATC
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D5AE-6250-A
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258/266
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0.428/0.433
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Intake: 12BTC/66ABC
Exhaust: 66BBC/20ATC
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D9TE-6250-A
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254/256
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0.433/0.433
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Intake: 18BTC/56ABC
Exhaust: 62BBC/14ATC
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Cam timing sets
When the 400 was introduced in the 1971 model year, it used the
same timing
set (camshaft and crankshaft sprockets and timing chain) as the
351C engines.
The camshaft sprocket and timing chain were both designed
originally for the
351C engine (with D0AE part numbers), and the crankshaft
sprocket was
originally designed for the 1968 Thunderbird 429 engine (with a
C8SE part
number).
In the 1973 model year, Ford retarded the camshaft timing in
351C 2V
and 400 engines for emissions control. To do this, they
redesigned the camshaft
timing set.
The new D3AE timing set used narrower sprockets (13/32" vs.
1/2") for the
camshaft and crankshaft, and a narrower 4-plate chain instead
of the
earlier 5-plate chain. The actual camshaft timing retard was
implemented
by changing the alignment of the keyway and “index” tooth on
the crankshaft
sprocket.
The following table lists M-block cam timing set part numbers.
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Description
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Part Number
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Casting ID
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Notes
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Camshaft sprocket
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DOAE-6256-A
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DOAE-6256-A
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All '71-'73 351C & 400, '77-up 351M/400 truck.
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Camshaft sprocket
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D3AE-6256-A
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D3AE-6256-A
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All '73-up 351C & 400 car, '75-up 351M car.
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Crankshaft sprocket
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C8SE-6306-A
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—
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Original (non-retarded) part.
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Crankshaft sprocket
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D3AE-6306-A
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—
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Retarded, all '73-'74 351C 2V & 400.
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Crankshaft sprocket
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D5AE-6306-A
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—
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Retarded, all '75-up 351M/400 car.
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Crankshaft sprocket
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D7TE-6306-A
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—
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Retarded, original 0.5" width, all '77-up 351M/400 trucks.
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Timing chain
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DOAE-6268-A
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—
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5-plate (wide), all '71-'73 351C & 400, '77-up 351M/400
truck.
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Timing chain
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D3AE-6268-A
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—
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4-plate (narrow), all '73-'74 351C 2V, '73-up 400 car,
'75-up 351M car.
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Camshaft thrust plate
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C8SZ-6269-A
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—
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All 351C, 351M/400.
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Crankshaft oil slinger
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D0AE-6310-A
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—
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All '71-'73 351C & 400.
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Some truck engines used the original non-retarded C8SE
crankshaft sprocket,
while others used the retarded D7TE sprocket.
Valve train
The original 351C 2V (and 400) intake and exhaust valves used
single-groove keepers on both valves. Starting in 1978, Ford
changed the M-block
exhaust valve to a multi-groove stem with rotating spring
retainers
to promote valve rotation.
The '78-up M-block exhaust valve requires different keepers,
retainers, and springs. Because of the height difference of the
rotating retainers, the valve springs used on rotating exhaust
valves have shorter free height and installed height, and
therefore,
they allow less lift than the stock intake valve springs. If
you
want to install an aftermarket camshaft for better performance,
you should not use the stock valve springs.
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CAUTION!
Stock intake valve springs go solid (coil bind) at 0.490"
valve lift.
The stock springs on early non-rotating exhaust valves allow
the same
lift as the stock intake valve springs, but the springs on
the later
rotating exhaust valves go solid at just 0.480" valve lift.
That is
less lift than many popular performance cams provide, even
the milder
ones like the Edelbrock #2172 (0.484/0.510 gross lift) and
the Comp
Cams 255DEH (0.469/0.505 gross lift). Using the stock
rotating
exhaust valve springs and retainers with either of those
cams will
cause bent push rods.
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The following table lists M-block valve train part numbers.
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Description
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Part Number
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Notes
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Push rod
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D1AE-6565-A
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All 351M/400 (standard length).
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Rocker arms
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D8AE-6564-B
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All '78-up 351M/400, w/ integral oil deflector.
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Rocker arm fulcrum
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E43Z-6A528-B
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OEM replacement, all 351M/400.
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Intake valve
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D9TZ-6507-A
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OEM replacement, all 351M/400.
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Exhaust valve
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D5AZ-6505-A
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OEM replacement, single-groove, all 351M/400.
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Exhaust valve
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D8TZ-6505-E
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OEM replacement, multi-groove, some '78-up 351M/400.
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Valve keeper
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DOAZ-6518-A
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OEM replacement, single-groove intake/exhaust, all 351C 2V,
351M/400.
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Valve keeper
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7HA-6518-A
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OEM replacement, multi-groove exhaust, some '78-up 351M/400.
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Valve spring
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D1AZ-6513-A
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OEM replacement, single-groove intake/exhaust, all 351C 2V,
351M/400.
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Valve spring
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D8AZ-6513-A
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OEM replacement, multi-groove exhaust, some '78-up 351M/400.
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Valve spring retainer
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D8AZ-6514-A
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OEM replacement, multi-groove exhaust, some '78-up 351M/400.
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Valve spring retainer
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E43Z-6514-A
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OEM replacement, single-groove intake/exhaust, all 351M/400.
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Pistons, pins, and connecting rods
Even though Ford used several different piston designs in
M-block engines
from 1971 to 1982, the piston pin and connecting rods were
never changed.
The M-block connecting rod is unique among Ford engines, but
the piston
pin is actually a 352/390FE design from 1966.
The following table lists M-block piston, pin, and connecting
rod
part numbers.
Note: Part numbers for M-block pistons are current
service parts only.
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Description
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Part Number
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Casting ID
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Notes
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Piston & pin set
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D5AZ-6108-A
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D5AZ-A
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OEM replacement, 351M truck.
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Piston & pin set
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D3AZ-6108-GB
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D3AZ-G
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OEM replacement, 400 truck.
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Piston pin only
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C6AZ-6135-A
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—
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All 351M/400.
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Piston ring set
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C3AZ-6148-F
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—
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All 351M/400.
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Connecting rod
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D1AE-6200-A
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D1AE-6210-A
D1AE-6210-AA
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All 351M/400.
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Oil pump and pickup tubes
All M-blocks used the same oil pump design, and the oil pickup
tube
corresponds with the oil pan (front sump or rear sump).
The following table lists M-block oil pump and oil pickup tube
part numbers.
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Description
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Part Number
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Notes
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Oil pump
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DOAE-6600-B
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All 351C, 351M/400.
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Oil pump pickup tube & screen
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D1AE-6622-A
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All 351M/400 front sump.
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Oil pump pickup tube & screen
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D9TE-6622-B
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All '77-'79 4WD truck w/ rear sump.
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Oil pump pickup tube & screen
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EOTE-6622-C
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All '80-up truck & van w/ rear sump.
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Oil pan and dipstick/tube part numbers are listed in the
Accessory and External Parts
section.
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