These are our popular Southern Jet marine manifolds for the LS series of engines

These high flow, alloy manifolds have been designed to gain optimum performance with long equal length primary runners. They are a one piece water jacketed manifold that feature individual runners for each port and they are water fed from the lowest point in four locations rather than from the end and one location.

These fit directly to the LS1,LS2,LS3,LSA and are also available port matched for the LS7 upon request

Exhaust breathers are highly recommended on all marine manifolds to break suction and avoid water ingress