2011 - Crane Cams

CAMSHAFTS
Ford-Mercury V-8 63-76
248
Application
Mechanical Roller Camshafts
Excellent low end and mid range torque and HP, fair idle,
moderate performance usage, mild bracket racing, auto
trans w/2800+ converter, 3200-3600 cruise rpm, 10.5 to
11.5 compression ratio advised.
Excellent mid range torque and HP, fair idle, moderate
performance usage, bracket racing, auto trans w/3500+
converter, 3800-4200 cruise RPM, 11.0 to 12.0 compression
ratio advised.
Good mid range torque and HP, rough idle, performance
usage, bracket racing, auto trans w/3500+ converter, 11.0
to 12.5 compression ratio advised.
Good mid range HP, rough idle, performance usage,
bracket racing, auto trans w/race converter, also large
plate or manifold nitrous system, 12.0 minimum compression
ratio advised.
Competition only, good upper RPM HP, bracket racing,
auto trans w/race converter, also manifold nitrous system,
good with aftermarket aluminum cylinder heads,
12.0 minimum compression ratio advised.
Competition only, good upper RPM HP, bracket racing,
auto trans w/race converter, also large manifold nitrous
system, good with aftermarket aluminum cylinder
heads, 12.5 minimum compression ratio advised.
Competition only, good upper RPM HP, manual trans or
auto trans w/race converter and trans brake, good with
aftermarket aluminum cylinder heads, 13.0 minimum
compression ratio advised.
Competition only, good upper RPM HP, manual trans or
auto trans w/race converter and trans brake, good with
aftermarket aluminum cylinder heads, 13.0 minimum
compression ratio advised.
Camshaft Series/
Grind Number
RPM range shown is for average usage. These cam profiles
will RPM higher, depending upon application.
IMPORTANT: Adjustable Vacuum Advance Kit available. See page
333 for details.
NOTE: Specify if late 62-406 cu.in. or 63-76 block is used, as the
cam is different than the one used in 58-62 block.
NOTE: In order to use these camshafts in mechanical lifter only
side oiler type blocks, you must groove the center of #2 and
#4 cam bearing journals with a .022” radius (.044” width)
and .035” deep.
RPM
POWER
RANGE
SR-240/350-2S-14 2800-
6600
SR-248/362-2S-10 3000-
6800
R-252/420-2-8 3400-
7200
R-260/420-2-10 3800-
7600
R-266/420-2-10 4200-
7800
R-276/420-2-10 4600-
8200
R-276/4334-2S2-10 4800-
8400
R-282/427-2S1-8 5000-
8400
Camshaft
PART NUMBER/
Emissions Code
CRANECAMS.COM
352-360-390-406-410-427-428 cu.in.
See pg. 296
LIFTERS
COMPLETE CAM SPECIFICATIONS
Degrees
Duration
@ .050”
Int/Exh.
Advertised
Degrees
Duration
Int/Exh.
Degrees
Lobe
Separation
Open/Close
@ .050”
Cam Lift
Int/Exh
Lash
Hot
Int.
Exh.
Gross
Lift
Int.
Exh.
348511 *a 30518-16 240 290 114 11 49 .020 .616
35570-16 b 248 298 63 5 .020 .637
3
348521 *a 30518-16 248 285 110 19 49 .020 .637
35570-16b 256 292 63 13 .020 .658
3
348801 *a 30518-16 252 284 108 22 50 .020 .739
35570-16b 262 294 63 19 .020 .739
3
348821 *a 30518-16 260 292 110 24 56 .020 .739
35570-16b 270 302 69 21 .020 .739
3
348831 *a 30518-16 266 298 110 27 59 .020 .739
35570-16b 276 308 72 24 .020 .739
3
348841 *a 30518-16 276 308 110 32 64 .020 .739
35570-16b 286 318 77 29 .020 .739
3
348291 *a 35570-16 b 276 316 110 31 65 .026 .763
282 322 74 28 .026 .727
3
348301 *a 35570-16b 282 286 108 38 64 .028 .752
282 320 74 32 .026 .752
NOTE: All grinds shown use the stock Ford 1.76 ratio adjustable
rocker arms - Ford part number B8A-6564-B or Crane
adjustable ductile iron rocker arms, 34772-16, in order to
achieve the listed gross valve lift figures.
NOTE: To effect valve adjustment with roller lifter camshafts, the
use of Crane adjustable rocker arms (34772-16 or 34791-
1) and appropriate pushrods (34641-16 or
95818-16) is required.
3
NOTE: Many 1972 and later Ford-Mercury V-8 engines are
originally equipped with a retarded crankshaft sprocket.
This may cause idling and performance problems when
installing aftermarket camshafts. We recommend using
a pre-1972 crankshaft sprocket, or by degreeing in your
camshaft. The non-retarded sprocket will have the alignment
dot and keyway slot directly in line with each other.
NOTE: Some cylinder heads have removable lower spring seats
with an inner spring step. This step must be removed to
allow the inner springs to set flush with the outer springs.