almost for sure a merc 502gen v has got a hydraulic flattappet camshaft.
HYDRAULIC FLAT TAPPET CAMSHAFT
ENGINE MODEL 7.4L
502 MAGNUM
8.2L
Lobe Lift ± 002 (0 051)
Exhaust .300 (7.62)
Intake.300 (7.62)
Duration at .050 In. ( 1.27mm)
C f
Exhaust 224°
Intake 224°
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