[Anthony]

Here's the specs from crane:

Part Number: 348461 Grind Number: R-258/3383-2-12
Engine Identification:
Start Yr. End Yr. Make Cyl Description
1963 1976 FORD-MERCURY 8 ROUGH IDLE, PERFORMANCE USAGE, GOOD MID & UPPER RPM H.P.
Engine Size Configuration
352-428 C.I. V

Valve Setting: Intake .028 Exhaust .030 HOT

Lift: Intake @Cam 3383 @Valve 595 All Lifts are based
on zero lash and theoretical rocker arm ratios.
Exhaust @ Cam 353 @Valve 621
Rocker Arm Ratio 1.76

Cam Timing: TAPPET @.020
Lift: Opens Closes ADV Duration
Intake 41 BTDC 75 ABDC 296 °
Exhaust 90 BBDC 36 ATDC 306 °

Spring Requirements: Triple Dual Outer Inner
Part Number 99874
Loads Closed 200 LBS @ 1.938 or 1 15/16
Open 535 LBS @ 1.361
Recommended RPM range with matching components
Minimum RPM 4000
Maximum RPM 7000
Valve Float 7400

Cam Timing: TAPPET @.050
Lift: Opens Closes Max Lift Duration
Intake 22 BTDC 56 ABDC 107 258 °
Exhaust 71 BBDC 17 ATDC 117 268 °

Remarks:



Crane Cams continuously improves and upgrades its cam designs. In some cases this may mean that two Crane Cams with the same part number may actually be different grinds. You must check the GRIND NUMBER stamped on the front of the camshaft and check it against the Grind Number near the top of the Spec Card. For more information on the finest available camshafts, valve train components, and automotive ignition products, visit your local Crane dealer or call the Crane Cams tech line at (386) 258-6174 or FAX (386) 258-6167


Kind of big on duration, but not very big on lift ( I-.595, E-.621), minus lash of .030, brings to I-.567, E-.591"