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Superior’s Millennium Cylinders® for Lycoming Engines

With well over 100,000 currently in service around the world and millions of flight hours behind them, Superiors Millennium Cylinders® are without question, the most popular FAA-approved, PMA aftermarket cylinders in all of general aviation.

Engine Eligibility
O-235-F, J (High Compression) SL10302-A20P
O-235-K, L, M (Medium Compression) SL10302-A21P
O-320-B, D; IO-320-B (Narrow Deck) SL32006N-A20P
O-320-B, D; IO-320-B, D; AIO-320-B, C; AEIO-320-D; LIO-320-B (Wide Deck) SL32006W-A20P
O-320-A, C, E; IO-320-A, E; AEIO-320-E (Wide Deck) SL32006W-A21P
O-360-A, C; IO-360-B; HO-360-B; HIO-360-B; O-540-A, D, E, G; IO-540-C, D, N; TIO-540-G (Narrow Deck) SL36006N-A20P
O-360-B, D; O-540-B (Narrow Deck) SL36006N-A21P
O-360-A, C, F, G; IO-360-B, E, M; HO-360-C; HIO-360-B; LO-360-A; AEIO-360-B, H; O-540-A, E, G, H; IO-540-C, D, N, T; AEIO-540-D (Wide Deck) SL36006W-A20P
O-360-B, D; O-540-B (Wide Deck) SL36006W-A21P