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71-73 351c original cam specs
#1
fyi 
I did some research on this*. Here's what I found for the various 4V engines:

Engine; Duration degrees: int, exh; lift: int, exh; timing opening & closing degrees; overlap degrees

70-71 closed 4v. Part #D0AZ6250B. Casting mark: backward "B" followed by "R".
266, 270; .427, .427; 14-72-70-20; 34

71 CJ.
270, 290; .480, .488; 18-72-82-28; 46

72-73 CJ. Part #D2ZZ6250B. Casting mark: backward "B" with a "V." It looks like "BV", again with the "B" character being backward.
270, 290; .480, .488; 14-76-78-32; 46

71 Boss 351 (mech cam).
270, 290; .477, .477; 34-76-86-24; 58

72-74HO (mech cam). Note: perhaps this cam continued to be used in Australia until 74??
275, 275; .491, .491; 17.5-77.5-77.5-17.5; 35

*The primary source I'm deciphering the data from is the "Ford Cleveland 335-Series V8 Engine" by Des Hammill.

Edited 8/18/12.
I found some more cam data. I've not compared to the above info yet.
http://home.comcast.net/~jelerath/mustan...ms-fr.html

351 Cleveland Camshaft Comparison
Part Number
Name
Type
Lift-intake/exhaust @ valve
Degrees of Duration
Characteristics
Recommendations

D0AZ-6250-B
'70-'72 351C 2V
Hydraulic
.400"/.400"
258/266
Stock
Stock

D0AZ-6250-C
'70-'71 351C 4V
Hydraulic
.420"/.450"
268/280
Stock
Stock

D1ZZ-6250-A
'71 351C Cobra Jet
Hydraulic
.481"/.490"
270/290
Great Performance Cam
Stock

D2ZZ-6250-B
'72 351C Cobra Jet
Hydraulic
.481"/.490"
270/290
Same as above, except indexed 4 degrees retarded
Use multi-index crank sprocket to advance 4 degrees

D1ZZ-6250-B
'71 351C Boss
Mechanical .025" Lash
.477"/.477"
290/290
Original Boss Cam {out of production}
4 Speed and Low Rear end gears Recommended

Same as above but after market.
Speed Pro #CS173R or Melling #24224.
290°/290° duration @ 0.004"
0.505"/0.505" lift
Exhaust valve opens at 84° BBDC
Intake valve closes at 74° ABDC
62° overlap
219°/219° duration @ 0.050"
114° lobe separation angle
Intake lobe centerline = 109° ATDC

SUM-K5200
Summit Racing
Hydraulic
.484"/.510"
{204/214 @ .050" lift}
Good Street Cam
4 barrel and headers suggested

322193
Competition Cams 260H High Energy Cam
Hydraulic
.484"/.484"
260/260 {212/212 @ .050" lift}
Good towing and RV cam
Stock
322213

Competition Cams 268H High Energy Cam
Hydraulic
.494"/.494"
268/268 {218/218 @ .050" lift}
Good performance cam, pulls strong, nice lope at idle
Headers and performance intake recommended

SUM-K5201
Summit Racing
Hydraulic
.509"/.509"
{218/228 @ .050" lift}
Good all around performance
4 Speed or high stall converter and Low Rear end gears Recommended

322224
Competition Cams 270H Magnum Cam
Hydraulic
.519"/.519"
270/270 {224/224 @ .050" lift}
Good street cam
Headers and performance intake recommended

M-6250-A341
Motorsports SVO
Hydraulic
.510"/.536"
292/302 {214/224 @ .050" lift}
Good all around Performance Cam
4 Speed or high stall converter and Low Rear end gears Recommended

D2ZZ-6250-A
'72 351C HO {High Output}
Mechanical .025" Lash
.490"/.490"
275/275
Lower duration provides good low rpm performance
High stall converter or 4 Speed recommended, as are lower rear end gears

322254
Competition Cams 280H Magnum Cam
Hydraulic
.530"/.530"
280/280 {230/230 @ .050" lift}
Good performance cam
Headers, performance intake suggested

00093LK
Lunati Cams
Hydraulic
.536"/.562"
{224/234 @ .050" lift}
Strong mid-rpm torque, 2000-6000 rpm
Headers, performance intake required

322344
Competition Cams 292H Magnum Cam
Hydraulic
.560"/.560"
292/292 {244/244 @ .050" lift}
Good Street/Bracket Race cam
Headers, performance intake required

M-6250-A342
Motorsports SVO
Mechanical
.580"/.606"
296/306 {248/258 @ .050" lift}
Very radical-race only camshaft
May require notching of piston heads for valve clearance, very high stall converter or 4 speed, and very high rear end gears

D1ZX-6250-FA
351C OHO {Off Highway Only}
Mechanical .025" Lash
.589"/.612"
326/334
Very radical-race only camshaft
May require notching of piston heads for valve clearance, very high stall converter or 4 speed, and very high rear end gears

[Image: 386_07_10_13_5_58_42.jpeg]
My Mustangs:
71 M-code Mach 1, Medium Blue/White Sport, 4R70W, 3L50, Factory Ram Air.
72 Q-code Mach 1, Pewter/Black Sport, 4-spd, 3L25.
65 Convertible, Britney Blue/White/White, more modified than original.
05 Convertible, Legend Lime/Tan/Tan, future classic??
  Reply
#2
That's because big brothers never tell!

[Image: 2rr7aiv.png]

Just cruising along minding our own business when BAM!!! The LAWS show up.
  Reply
#3
Any idea as to the part numbers or identifying markings for these cams?
I believe the 73 CJ cam is the same as the 72, it's just retarded 4 degrees for the 1973 emissions changes implemented that year.
  Reply
#4
From everything I have seen, the 1973 351CJ shared the exact same camshaft as the one found in the 1972 351CJ. According to the "Hollander Interchange Manual", the part number for both camshafts is D2ZZ6250B.

The casting number is what looks like a backward "B" with a "V." It looks like "BV", again with the "B" character being "backward."

I do not know how to recreate that character (the backward "B") on this keyboard but hopefully y'all will have an appreciation for what I am trying to convey. LOL

BT

Do the RIGHT thing.
  Reply
#5
I don't have the Ford part numbers. Perhaps the rest of the cam part numbers are in BT's reference "Hollanders Interchange Manual". I'll update the post with any that turn up.

It looks like the 71CJ cam is very similar to the 72/73CJ cam with the 72/73 cam having a 4 degree retarded grind. Then in 73 it was retarded again by 4 degrees at the distributor.

[Image: 386_07_10_13_5_58_42.jpeg]
My Mustangs:
71 M-code Mach 1, Medium Blue/White Sport, 4R70W, 3L50, Factory Ram Air.
72 Q-code Mach 1, Pewter/Black Sport, 4-spd, 3L25.
65 Convertible, Britney Blue/White/White, more modified than original.
05 Convertible, Legend Lime/Tan/Tan, future classic??
  Reply
#6
I knew you'd find it. Good to know!

[Image: 2rr7aiv.png]

Just cruising along minding our own business when BAM!!! The LAWS show up.
  Reply
#7
If I recall correctly the cam retard in 73 was in the timing chain not the cam.

Thanks for the great info Don!

Jeff T.

Low buck, touring style, '73 Convertible "rolling restoration", 351c, 2v heads with a shave and a haircut, Performer intake, Holley 650(ish), roller rockers, screw in studs, guideplates, stainless valves, Duraspark / Motorsports MSD, T-5 conversion. 1-1/8" front, 3/4" rear swaybars KYB shocks and some home brewed subframe connectors. Future plans; JGC steering box, Cobra brakes and... paint, interior, etc.

When I die I want to die like grandpa, peacefully in my sleep... not screaming, like his passenger.

[Image: 1_12_09_14_10_15_11.png]
  Reply
#8
I have data for a few aftermarket cams that I can add if there is any interest.

[Image: 386_07_10_13_5_58_42.jpeg]
My Mustangs:
71 M-code Mach 1, Medium Blue/White Sport, 4R70W, 3L50, Factory Ram Air.
72 Q-code Mach 1, Pewter/Black Sport, 4-spd, 3L25.
65 Convertible, Britney Blue/White/White, more modified than original.
05 Convertible, Legend Lime/Tan/Tan, future classic??
  Reply
#9
Updated original post with more cams & part numbers.

[Image: 386_07_10_13_5_58_42.jpeg]
My Mustangs:
71 M-code Mach 1, Medium Blue/White Sport, 4R70W, 3L50, Factory Ram Air.
72 Q-code Mach 1, Pewter/Black Sport, 4-spd, 3L25.
65 Convertible, Britney Blue/White/White, more modified than original.
05 Convertible, Legend Lime/Tan/Tan, future classic??
  Reply
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