WHICH CAMS NEED VALVE SPRINGS: BC 3s
Crower 2.4: stg2s
Crower 2.0: stg1 and up
Crane 16's and larger
all else are fine w/ stock springs
VALVE SPRINGS: Crane Valve Springs
Outside diameter: 1.065
Inside diameter: 0.725
Seat pressure: 60lbs@1.535
Open pressure: 255lbs@1.063
Coil bind: 0.987
Rate: 413
Maximum net lift: 0.472
Brian Crower Valve Springs
Seat Pressue: 1.500" @ 92 lbs
Open Pressure: 1.100" @ 195 lbs
Coil Bind: 0.920"
Ferrea Valve Springs
Stage 1
S10107 Dual Spring
Inside diameter: 20.8 mm
Outside diameter: 28.0 mm
Seat Pressue: 90lbs@37mm
Open Pressure: 200lbs@27mm
Rate Inch: 279lbs
Coil Bind: 23mm
Max Net Lift: 12mm
Stage 2
S10108 Dual Spring
Inside diameter: 20.8 mm
Outside diameter: 28.0 mm
Seat Pressue: 105lbs@37mm
Open Pressure: 235lbs@27mm
Rate Inch: 330lbs
Coil Bind: 23.5mm
Max Net Lift: 12mm
The Stage 1 and 2 spring requires Ferrea Titanium Retainer #E11074 and BOTH, Ferrea spring seat locator # SL1062 and factory supplied spring seat locator.
SOHC Crane Springs in the DOHC head
Outside Diameter: 1.065
Inside Diameter: 0.725
Seat Pressure: 85lbs@ 1.535
Open Pressure: 244lbs@ 1.135
Coil Bind: 1.014
Rate: 397
Maximum Net Lift: 0.440
DCRValve Springs w/ Moly Retainers
120lbs @ 1.535 @ base
290lbs @ 1.035 @ max lift and .060 from coil bind.
10,000 rpm tested at over 65lbs of boost!
$300 set
Here are the only Cam spec timing cards I found on the Crane website.
Crane 12's
Lift: Intake @Cam 5.32mm @Valve 9.25mm All Lifts are based
on zero lash and theoretical rocker arm ratios.
Exhaust @ Cam 5.32mm @Valve 9.25mm
Rocker Arm Ratio 1.737
Crane 14's
Lift: Intake @Cam 5.32mm @Valve 9.25mm All Lifts are based
on zero lash and theoretical rocker arm ratios.
Exhaust @ Cam 5.03mm @Valve 8.76mm
Rocker Arm Ratio 1.740
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