Custom Marine Inc. - Small Block Chevy Headers

LT / Small Block Chevy E-Top Headers - Satin

Works as stock Mercury replacement or for most Stern Drives and Jet boats. 4" Hose connection. Made from 316L Stainless Steel. Bolts directly in the existing location of your stock manifolds. This is a single engine set and will directly replace both manifolds.

ALL CMI HEADERS ARE MADE TO ORDER AND SHIP FROM THE FACTORY IN 3-4 WEEKS

LT / Small Block Chevy E-Top Headers - Polished

Works as stock Mercury replacement or for most Stern Drives and Jet boats. 4" Hose connection. Made from 316L Stainless Steel. Bolts directly in the existing location of your stock manifold.

ALL CMI HEADERS ARE MADE TO ORDER AND SHIP FROM THE FACTORY IN 3-4 WEEKS

LT / Small Block Chevy E-Top Headers - Polished

CMI Small Block Elbow Top headers are designed for small block LT engine builders and stern drive manufacturers who want to optimize performance of small marinized engines prefer CMI Elbow Top headers for their 450 HP and above engines. They feature large 1 7/8” primaries. CMI E-Top systems offer separated exhaust passages with long individual exhaust tube runners to minimize cylinder to cylinder influence and improve exhaust gas scavenging, which allows the engine to breathe freely and deliver peak performance power. Each header features a permanently attached, non-adjustable exhaust tailpipe configured to meet precise specifications for standard transom layouts and placement of thru-hull exhaust tips. This header kit comes complete with our upgraded stainless steel water distribution tube, cooling water bypass couplings installed on the collector elbow, by-pass hose fittings, attaching cap screws, exhaust port gaskets, hose clamps and cooling water inlet fittings needed for most installations.

ALL CMI HEADERS ARE MADE TO ORDER AND SHIP FROM THE FACTORY IN 3-4 WEEKS

CMI Small Block Chevy Sport Tube Exhaust System, Polished (Big Block Pictured, no Small Block Image Available)

CMI Sport Tubes are a superior long tube header designed for both racing or virtually any high-performance application. For big- and small-block applications where maximum scavenging and horsepower are required, CMI Sport Tube headers deliver peak performance and power from naturally aspirated engines that generate more than one horsepower per cubic inch of displacement.

The all polished Sport Tube system is offered with a range of exhaust tailpipe options, as well as CMI's Sound Choice™ selectable silencing system. Each system includes all header attaching bolts, gaskets and cooling fittings required for installation.

Note: All CMI Systems are sold without Tailpipes

ALL CMI HEADERS ARE MADE TO ORDER AND SHIP FROM THE FACTORY IN 3-4 WEEKS