| Hydraulic liters (Std., opt., NA) |
Standard |
Not Available |
Standard |
Valve rotator, type
(intake, exhaust) |
Ford Free Turn Intake and Exhaust | Positive on Exhaust (Two Piece) |
| Rocker Ratio |
1.4:1 to 1.6:1 |
1.46:1 |
1.61:1 |
| Operating tappet clearance (indicate hot or cold) |
Intake |
Zero |
.014 Hot Between Valve Tip and Rocker Foot |
Zero (.090 - .190) (a) |
| Exhaust |
-- |
.016 Hot Between Valve Tip and Rocker Foot |
Zero (.090 - .190) (a) |
| Timing (based on top of ramp points) |
Intake |
Opens (°BTC) |
22° |
20° |
20° |
| Closes (°ABC) |
66° |
56° |
70° |
| Duration (deg.) |
268° |
256° |
270° |
| Exhaust |
Opens (°BTC) |
64° |
62° |
44° |
| Closes (°ATC) |
24° |
14° |
24° |
| Duration (deg.) |
268° |
256° |
248° |
| Valve open overlap (deg.) |
46° |
34° |
44° |
| Intake |
Material (b) |
SAE-1047 Steel |
CK 45 DIN 17200 |
SAE-1047 Steel |
| Overall length |
4.757 |
4.157 |
5.050 |
| Actual overall head dia. |
1.735 |
1.5695 |
1.782 |
| Angle of seat & face (deg.) |
Seat 44° 30' to 45° Face 45° 30' to 45° 45' |
| Seat insert material |
NONE |
| Stem diameter |
.3427 - .3420 |
.3167 - .3157 |
.3423 - .3416 |
| Stem to Guide clearance |
.0006 - .0023 |
.0008 - .0025 |
.0017 - .0027 |
| Lift (@ zero lash) |
.400 |
.373 |
.368 |
| Outer spring press. & length |
Valve closed
(lb. @ in.) |
71 - 79 @ 1.56 |
60 - 68 @ 1.585 |
76 - 84 @ 1.69 |
Valve open
(lb. @ in.) |
179 - 198 @ 1.16 |
138 - 149 @ 1.222 |
190 - 210 @ 1.31 |
| Inner spring press. & length |
Valve closed
(lb. @ in.) |
NONE |
Valve open
(lb. @ in.) |
NONE |
| Exhaust |
Material (b) |
Cast Austenitic |
HD: 21-4N Steel (Stem: X45) |
Cast Austenitic |
| Overall length |
4.777 |
4.161 |
4.99 Plus .06 Cap |
| Actual overall head dia. |
1.500 |
1.2685 |
1.451 |
| Angel of seat & face (deg.) |
Seat 44° 30' to 45° Face 45° 30' to 45° 45' |
| Seat insert material |
NONE |
| Stem diameter |
.3418 - .3411 |
.3156 - .3149 |
.3418 - .3411 |
| Stem to Guide clearance |
.0015 - .0032 |
.0018 - .0035 |
.0015 - .0032 |
| Lift (@ zero lash) |
.400 |
.373 |
.380 |
| Outer spring press. & length |
Valve closed
(lb. @ in.) |
71 - 79 @ 1.56 |
60 - 68 @ 1.585 |
76 - 84 @ 1.60 |
Valve open
(lb. @ in.) |
179 - 198 @ 1.16 |
138 - 149 @ 1.222 |
190 - 210 @ 1.22 |
| Inner spring press. & length |
Valve closed
(lb. @ in.) |
NONE |
Valve open
(lb. @ in.) |
NONE |
