SMALL BLOCK V-8 HYDRAULIC ROLLER TAPPET CAMSHAFTS
The legendary B303 cam developed by Ford Performance for the 5.0L Fox-body Mustang. This cam provides a noticeable power improvement and lumpy idle while maintaining good driveability with a manual transmission. Works well with carburetors or mass air fuel injection.
- Fits 1985 and later 302 roller cam blocks
- Will also fit 1963-1984 non-roller cam 289-302 blocks when used with aftermarket tie-bar hydraulic roller lifters
- Will also fit 1994-1997 351W blocks with factory roller cam
- Will also fit 1969-1993 non-roller cam 351W blocks when used with aftermarket tie-bar hydraulic roller lifters
- Requires upgraded valve springs
- Valve spring requirements: 120 lbs valve seat pressure minimum 295 lbs open.
- On EFI engines, performance camshafts work only with mass air induction systems. Will not work with Explorer EEC-V EFI or speed density EFI systems.
- Also fits 1994-97 351W with factory roller cam when used with mass air EFI.
- Stock 5.0L HO cam advertised specs are 266°/266° duration, 0.444"/0.444" lift.
- Higher stall torque converter recommended for automatic transmission
| PART NUMBER | ENGINE |
ROCKER
RATIO |
INTAKE EVENTS
(0.050") |
EXHAUST EVENTS
(0.050") |
DURATION
(SAE) |
LIFT
(INCHES) |
LOBE
CENTER |
|||||
| OPEN | CLOSE | OPEN | CLOSE | INT. | EXH. | LOBE | VALVE | INT. | EXH. | |||
|
M-6250-B303*
(1)(2)(3)(6) |
1985 and Later 302 Roller Cam | 1.60 | 5° BTC | 39° ABC | 49° BBC | 5° BTC | 284° | 284° | .300 I | .480 I | 107° | 117° |
| 224° | 224 | .300E | .480 E | |||||||||
|
M-6250-E303
(1)(2)(3)(6) |
1985 and Later 302 Roller Cam | 1.60 | 0° BTC | 40° ABC | 40° BBC | 0° BTC | 282° | 282° | .311 I | .498 I | 110° | 110° |
| 220° | 220° | .311E | .498 E | |||||||||
|
M-6250-F303*
(1)(2)(3)(4) (6)(7) |
1985 and Later 302 Roller Cam | 1.60 | 4° BTC | 42° ABC | 52° BBC | 6° BTC | 288° | 288° | .320 I | .512 I | 109° | 119° |
| 226° | 226° | .320E | .512 E | |||||||||
|
M-6250-X303*
(1)(2)(3)(4) (6)(8) |
1985 and Later 302 Roller Cam | 1.60 | 5° BTC | 39° ABC | 49° BBC | 5° BTC | 286° | 286° | .339 I | .542 I | 107° | 117° |
| 224° | 224° | .339E | .542 E | |||||||||
|
|
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NOTE: Camshaft intake and exhaust valve events are measured at 0.050" tappet lift. The duration figures in the shaded area are taken at 0.050" tappet lift. This is useful to check the cam with a degree wheel during installation. The solid color is advertised duration. For comparison purposes, add intake and exhaust lobe centers and divide by 2 to calculate "camshaft centerline" specification for Ford Performance camshafts.
NOTES: (1) On EFI engines, performance camshafts work only with mass air induction systems. Will not work with Explorer EEC-V EFI. (2) Also fits 1994-97 351W with factory roller cam when used with mass air EFI. (3) Stock 5.0L HO cam advertised specs are 266°/266° duration, 0.444"/0.444" lift. (4) May require piston modification for piston-to-valve clearance. Valve clearance should be checked. (5) May require longer pushrods. (6) Hi-Stall torque converter recommended for automatic trans. (7) Great for superchargers. Manual transmission recommended. (8) Good torque and power up to 6200 RPM. Manual transmission recommended.
