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1928-35 D T Models: 600,700,801,603A,740A; 3-6 TON ; Herc.Y X C , 6cyl. THOMPSON PRODUCTS PART NO. ‘ s : VALVES: EXH. S619 ; INT. V619 ; ( SLOTTED STEM ; DRILL STEM ; EXH. S659 ; INT. V659 ) . VALVE GUIDES: EXH. G267 ; INT. G266 .