502 Mag MPI cam specs
03-11-2005, 07:42 AM
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Location: Cumming GA
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Re: 502 Mag MPI cam specs
I have a new in the box Crane 721 cam that is collecting dust on my shelf that I can make somebody an excellent deal on. Should be good for an upgrade.
SPECS: #139721
Valve Setting: Intake .000 Exhaust .000 HOT
Lift: Intake @Cam 325 @Valve 553 All Lifts are based
on zero lash and theoretical rocker arm ratios.
Exhaust @ Cam 339 @Valve 576
Rocker Arm Ratio 1.70
Cam Timing: TAPPET @.004
Lift: Opens Closes ADV Duration
Intake 29.0 BTDC 67.0 ABDC 276.0 °
Exhaust 73.0 BBDC 31.0 ATDC 284.0 °
Spring Requirements: Triple Dual Outer Inner
Part Number 99896
Loads Closed 132 LBS @ 1.906 or 1 29/32
Open 395 LBS @ 1.346
Recommended RPM range with matching components
Minimum RPM 2000
Maximum RPM 5500
Valve Float 6500
Cam Timing: TAPPET @.050
Lift: Opens Closes Max Lift Duration
Intake 2.0 BTDC 32.0 ABDC 105 214.0 °
Exhaust 46.0 BBDC (4.0) BTDC 115 222.0 °
May not be much different but may still help somebody that needs a replacement.
SPECS: #139721
Valve Setting: Intake .000 Exhaust .000 HOT
Lift: Intake @Cam 325 @Valve 553 All Lifts are based
on zero lash and theoretical rocker arm ratios.
Exhaust @ Cam 339 @Valve 576
Rocker Arm Ratio 1.70
Cam Timing: TAPPET @.004
Lift: Opens Closes ADV Duration
Intake 29.0 BTDC 67.0 ABDC 276.0 °
Exhaust 73.0 BBDC 31.0 ATDC 284.0 °
Spring Requirements: Triple Dual Outer Inner
Part Number 99896
Loads Closed 132 LBS @ 1.906 or 1 29/32
Open 395 LBS @ 1.346
Recommended RPM range with matching components
Minimum RPM 2000
Maximum RPM 5500
Valve Float 6500
Cam Timing: TAPPET @.050
Lift: Opens Closes Max Lift Duration
Intake 2.0 BTDC 32.0 ABDC 105 214.0 °
Exhaust 46.0 BBDC (4.0) BTDC 115 222.0 °
May not be much different but may still help somebody that needs a replacement.
Last edited by pachangalpina; 03-11-2005 at 07:48 AM.
