Camshaft for a 502 mag
03-25-2009, 12:14 PM
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Camshaft for a 502 mag
Anyone know, or able to cross reference the std cam in a Mercruiser 502 Mag, around 92-93. I know if I buy one from Merc it'll probably turn up in a Crane box.
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03-25-2009, 02:02 PM
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MarineKinetics
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The Merc 431-9830 cam is still available through GM dealers as GM part #14096209. GM rates this cam as 220º/220º @.050 .500/.500 LSA 115º, while other sources rate it 224º/224º @.050 .510/.510 LSA 115.5º. Either way it's the same cam. They have a version of this cam ground +5º as part# 10185060. The 14096209 cam has an intake lobe centerline of 114º ATDC and the 10185060 has an ICL of 109º ATDC advancing the ICL 5º. Both part #s are still active @ Scoggin-Dickey.
Bob
Bob
03-26-2009, 02:48 AM
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Many thanks for that, but I've just discovered the motor is a Gen 6, with roller lifters. The Merc cam #431-850478 is for an MPI motor, but this one is on a Holley. Any idea what the GM part # would be?
03-26-2009, 08:04 AM
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Merc Mag Roller
Merc# 431-850478 / GM#12551622
.004 300 / 300
.006 288 / 288
.050” 225 / 225
.200” 125 / 125
Lift .483”/. 483”
ICL 109*
LSA 115.5*
