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Approved for TCM:
IO-520 • TSIO-520 • IO-550 • TSIO-550 • TSIOL-550-A
Front alternator model engines only!
Replaces: TCM PN: 653058A1
RAM PN: 1058-1A
PMA New - outright: $1,085
Plus .020" available |
Provides 3% improved fuel economy at 65% power, or 3% more power at original fuel flow. This is accomplished by a slight reduction in lift, duration and overlap. The reduced duration and overlap lessens the amount of fuel/air charge lost through the exhaust port during cylinder scavenging. The reduced lift is incorporated to minimize valve gear acceleration, stress and wear, thus improving durability. Easier starting and improved idle.
25% reduction in valve train component structural loads.
RAM’s 1058-1A Camshaft is shot peened for stress relief, then dry-film lubricated by painting, baking and burnishing a lead/tin/graphite resin on each camshaft. The camshaft thereby achieves long term wear reduction. |
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