Cummins 855 Old Design, High Mounting Boss Exhaust Manifold, 3801915

Fits Cummins NT855 - Late Style Small Cam and Big Cam  I, II, III, IV, NT88 IV
"Pulse" Exhaust Manifold Kit. Small Exhaust Port
Please note: This manifold features High Mounting Bosses at each exhaust port, which is an outdated design. The Low Mounting Boss design replaces High Mounting Boss manifolds. Low Boss style uses bolts and spacers instead of clamps at each port. For best value, we recommend ordering our updated design, Low Boss manifold number 174980, which will include all of the hardware you need to switch to the latest style manifold.   
Exhaust Manifold Kit Includes:
1 Center Section - Cummins # 3052859, 3029614, 3031185 1 Front Section - Cummins # 3053138, 3031186, 3020717 1 Rear Section - Cummins # 3053137, 3031187, 3020718 Mounting Hardware Kit
Mounting Hardware Kit Includes: 6) Exhaust Manifold Port Gasket (3020943) 1) Turbo Flange Gasket (3069177) 4) Turbo Nut 4) Turbo Stud 12) Bolt
The original 3801322 Exhaust Manifold used sealing rings between the end and center sections. Through the years, these sealing rings have commonly failed due to repeated exposure to extreme heat cycles. When these sealing rings fail, exhaust leaks become present. Our exhaust system was designed to replace the original style manifold in order to offer a longer lasting, more superior product. It features a precision machined, slip-fit connection between end and center sections. No sealing rings are used with the new system. They are eliminated entirely. You will no longer have to worry about a failed seal causing unwanted noise, decreased engine performance or replacement down-time.