| Part Number | Application | Lifter | Lash | Intake Events | Exhaust Events | Duration | Lift | Overlap | Identification | ||||||
| Engine | Year | Open | Close | Open | Close | Intake | Exhaust | Lobe | Valve | Mark | Location | ||||
| C0AZ-6250-A | 352/390 | 60/62 | Hyd | 26 ° BTC 31 ° ATC |
64 ° ABC 5 ° ABC |
67 ° BBC 10 ° BBC |
23 ° ATC 36 ° BTC |
270 ° | 270 ° | .232 | .401 | 49 ° | AA | Between Dist Gear and First Journal |
|
| C2SZ-6250-A | 390--V6 | 61/62 | Hyd | 28 ° 30 BTC 29 ° 30 ATC |
77 ° 30 ABC 14 ° 30 ABC |
76 ° 30 BBC 18 ° 30 BBC |
29 ° 30 ATC 33 ° 30 BTC |
286 ° | 286 ° | .258 | .446 | 58 ° | Pink Stripe | Between Dist Gear and First Journal |
|
| C3AZ-6250-D | 390/406--V4, V6, 8V 428--PC |
63 66 |
Mech | .025 | 40 ° 30 BTC 14 ° 30 ATC |
85 ° 30 ABC 29 ° 30 ABC |
88 ° 30 BBC 33 ° 30 BBC |
37 ° 30 ATC 18 ° 30 BTC |
306 ° | 306 ° | .298 | .500 | 78 ° | (Upside Down "A")B | Between Last Lobe and Last Journal |
| C3AZ-6250-T | 390/PC | 63/65 | Mech | .025 | 28 ° 30 BTC 28 ° 30 ATC |
73 ° 30 ABC 16 ° 30 ABC |
76 ° 30 BBC 19 ° 30 BBC |
25 ° 30 ATC 31 ° 30 BTC |
282 ° | 282 ° | .246 | .440 | 54 ° | (Upside Down "A")AA | Between Last Lobe and Last Journal |
| C3AZ-6250-U | 352/390--PC | 65/62 | Hyd | 22 ° BTC 35 ° ATC |
68 ° ABC 9 ° ABC |
68 ° BBC 11 ° BBC |
22 ° ATC 37 ° BTC |
270 ° | 270 ° | .232 | .401 | 44 ° | YA | Between Last Lobe and Last Journal |
|
| *C3AZ-6250-AA | 427--4V/SPL --8V/SPL |
63/67 | Mech | .025 | 40 ° 30 BTC 14 ° 30 ATC |
85 ° 30 ABC 29 ° 30 ABC |
88 ° 30 BBC 19 ° 30 BBC |
37 ° 30 ATC 18 ° 30 BTC |
306 ° | 306 ° | .298 | .500 | 78 ° | (Upside Down "A")BA | Between Last Lobe and Last Journal |
| C3SZ-6250-A | 390--6V/SPL | 63 | Hyd | 22 ° BTC 36 ° ATC |
68 ° ABC 9 ° ABC |
68 ° BBC 10 ° BBC |
22 ° ATC 37 ° BTC |
270 ° | 270 ° | .232 | .401 | 44 ° | (Upside Down "A")A | Between Dist Gear and First Journal |
|
| *C4A5-6250-B | 427 | 63/67 | Mech | .025 | 22 ° BTC 36 ° ATC |
88 ° ABC 28 ° ABC |
88 ° BBC 31 ° BBC |
56 ° ATC 3 ° ATC |
324 ° | 324 ° | .248 | .500 | 112 ° | (Upside Down "A")M | Between Dist Gear and First Journal |
| C6AZ-6250-A | 390/428 390--GT |
67/69 | Hyd | 16 ° BTC 32 ° ATC |
68 ° ABC 8 ° ABC |
55 ° BBC 7 ° BBC |
21 ° ATC 31 ° BTC |
256 ° | 256 ° | .253 | .438 | 37 ° | (Upside Down "A")U | Between Dist Gear and First Journal |
|
| C6OZ-6250-B | 390--GT 428--CJ |
66/68 68/70 |
Hyd | 18 ° BTC 30 ° ATC |
72 ° ABC 22 ° ABC |
82 ° BBC 28 ° BBC |
28 ° ATC 24 ° BTC |
270 ° | 290 ° | .278 .283 |
.481-I .490-E |
46 ° | Light Blue | Both Sides of No. 3 Journal |
|
| C7AZ-6250-A | 390--2V | 67 | Hyd | 13 ° BTC 35 ° ATC |
63 ° ABC 22 ° ABC |
63 ° BBC 14 ° BBC |
23 ° ATC 28 ° BTC |
256 ° | 266 ° | .247 .249 |
.427-I .431-E |
36 ° | (Upside Down "A")X | Between Last Lobe and Last Rear Journal |
|
| *C8AZ-6250-A | 427-Auto | 68 | Hyd | 18 ° BTC 29 ° ATC |
72 ° ABC 23 ° ABC |
82 ° BBC 29 ° BBC |
28 ° ATC 19 ° BTC |
270 ° | 290 ° | .278 .283 |
.481-I .490-E |
46 ° | ABAB | Between Last Lobe and Last Rear Journal |
|
| *C8AX-6250-D | 427 | 63/67 | Mech | .025 | 60 ° BTC 13 ° ATC |
90 ° ABC 39 ° ABC |
94 ° BBC 47 ° BBC |
56 ° ATC 5 ° ATC |
330 ° | 330 ° | .355 | .600 | 116 ° | C8AX-D | On End of Last Journal |
| C8AX-6250-C | 427 | 63/67 | Hyd | 24 ° BTC 22 ° ATC |
78 ° ABC 30 ° ABC |
82 ° BBC 34 ° BBC |
34 ° ATC 18 ° BTC |
282 ° | 296 ° | .289 | .500 | 58 ° | C8AX-C | On End of Last Journal |
|
* Has grooves in 2nd and 4th Journal.
Requires 0.100-inch milled off valve guide bosses and special non-Ford lightweight valve springs, retainers and pushrods because of 0.600-inch valve lift.
Valve lift shown is for stock rockerarm ratios for noted engine and can type
(1.73:1 for HYD or 1.76:1 for MECH)
Two sets of lift figures denotes different lifts for (1) intake and (2) exhaust lobes.