Internal Engine Parts

M-Block 351M/400 Parts Reference

Internal Engine Parts

Copyright © 2002-2003 Dave Resch
All rights reserved.


This section lists Ford part numbers and casting ID codes for the following internal parts of M-block (351M/400) engines:

  • Camshafts
  • Cam timing sets
  • Valve train
  • Pistons, pins, and connecting rods
  • Oil pump and pickup tubes

 

Crankshaft part numbers and casting ID codes are listed in the Cast Iron Parts section.

Check out this section if you are not familiar with Ford part numbers and ID codes.

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.

Model Year Part Number Notes
1971-1973 D1AE-6250-A Original 400 car camshaft.
1974,
1977-1979
D4AE-6250-A ’74 400 car, all ’77-’78 351M/400 truck, ’79 400 HD truck.
1975-1979 D4AE-6250-B All ’75-’79 351M car, ’78 351M Bronco, ’79 351M HD truck.
1975-1979 D5AE-6250-A All ’75-’79 400 car.
1979-1982 D9TE-6250-A All ’79 351M/400 LD truck, ’80-up 351M/400 truck.
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.
Camshaft Duration Gross Lift Valve Event Timing
D1AE-6250-A 256/272 0.422/0.427 Intake: 17BTC/59ABC
Exhaust: 71BBC/21ATC
D4AE-6250-A 250/272 0.428/0.433 Intake: 17BTC/53ABC
Exhaust: 65BBC/27ATC
D4AE-6250-B 258/266 0.406/0.406 Intake: 19.5BTC/58.5ABC
Exhaust: 58.5BBC/27.5ATC
D5AE-6250-A 258/266 0.428/0.433 Intake: 12BTC/66ABC
Exhaust: 66BBC/20ATC
D9TE-6250-A 254/256 0.433/0.433 Intake: 18BTC/56ABC
Exhaust: 62BBC/14ATC

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.

Description Part Number Casting ID Notes
Camshaft sprocket DOAE-6256-A DOAE-6256-A All ’71-’73 351C & 400, ’77-up 351M/400 truck.
Camshaft sprocket D3AE-6256-A D3AE-6256-A All ’73-up 351C & 400 car, ’75-up 351M car.
Crankshaft sprocket C8SE-6306-A Original (non-retarded) part.
Crankshaft sprocket D3AE-6306-A Retarded, all ’73-’74 351C 2V & 400.
Crankshaft sprocket D5AE-6306-A Retarded, all ’75-up 351M/400 car.
Crankshaft sprocket D7TE-6306-A Retarded, original 0.5″ width, all ’77-up 351M/400 trucks.
Timing chain DOAE-6268-A 5-plate (wide), all ’71-’73 351C & 400, ’77-up 351M/400 truck.
Timing chain D3AE-6268-A 4-plate (narrow), all ’73-’74 351C 2V, ’73-up 400 car, ’75-up 351M car.
Camshaft thrust plate C8SZ-6269-A All 351C, 351M/400.
Crankshaft oil slinger D0AE-6310-A All ’71-’73 351C & 400.
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.

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.
The following table lists M-block valve train part numbers.
Description Part Number Notes
Push rod D1AE-6565-A All 351M/400 (standard length).
Rocker arms D8AE-6564-B All ’78-up 351M/400, w/ integral oil deflector.
Rocker arm fulcrum E43Z-6A528-B OEM replacement, all 351M/400.
Intake valve D9TZ-6507-A OEM replacement, all 351M/400.
Exhaust valve D5AZ-6505-A OEM replacement, single-groove, all 351M/400.
Exhaust valve D8TZ-6505-E OEM replacement, multi-groove, some ’78-up 351M/400.
Valve keeper DOAZ-6518-A OEM replacement, single-groove intake/exhaust, all 351C 2V, 351M/400.
Valve keeper 7HA-6518-A OEM replacement, multi-groove exhaust, some ’78-up 351M/400.
Valve spring D1AZ-6513-A OEM replacement, single-groove intake/exhaust, all 351C 2V, 351M/400.
Valve spring D8AZ-6513-A OEM replacement, multi-groove exhaust, some ’78-up 351M/400.
Valve spring retainer D8AZ-6514-A OEM replacement, multi-groove exhaust, some ’78-up 351M/400.
Valve spring retainer E43Z-6514-A OEM replacement, single-groove intake/exhaust, all 351M/400.

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.

Description Part Number Casting ID Notes
Piston & pin set D5AZ-6108-A D5AZ-A OEM replacement, 351M truck.
Piston & pin set D3AZ-6108-GB D3AZ-G OEM replacement, 400 truck.
Piston pin only C6AZ-6135-A All 351M/400.
Piston ring set C3AZ-6148-F All 351M/400.
Connecting rod D1AE-6200-A D1AE-6210-A
D1AE-6210-AA
All 351M/400.

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.

Description Part Number Notes
Oil pump DOAE-6600-B All 351C, 351M/400.
Oil pump pickup tube & screen D1AE-6622-A All 351M/400 front sump.
Oil pump pickup tube & screen D9TE-6622-B All ’77-’79 4WD truck w/ rear sump.
Oil pump pickup tube & screen EOTE-6622-C All ’80-up truck & van w/ rear sump.
Oil pan and dipstick/tube part numbers are listed in the Accessory and External Parts section.

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