TUBETTO CATERPILLAR: CA7B2420, 7B2420 INSTALLATO SU: D342 MARINE ENGINE 32B01540-UP 7N-3803: CYLINDER BLOCK GROUP D342 MARINE ENGINE 50B01025-UP 7N-3803: CYLINDER BLOCK GROUP D342 ENGINE 49B01091-UP 7N-3803: CYLINDER BLOCK GROUP G398 & G399 NATURAL GAS ENGINE, D379, D398, AND D399 ENGINES OVERHAUL AND M AINTENANCE KITS ONLY, FOR 6.25 BORE HIGH & LOW COMPRESSION ENGINE 34Z00001-UP G342 ENGINE 71B00001-UP 7N-4353: CYLINDER BLOCK GROUP 7N-4011: CYLINDER BLOCK GROUP