Manifold,, Intake 5.7 AL W/O BR Aluminum Performance manifold for 5.0L/305ci & 5.7L/350ci Vortec Marine engines. Intake manifold is secured to heads with 8 bolts. This manifold is a perfect performance upgrade for Mercruiser and Volvo engines with both two and four barrel carburetors. Two barrel applications require a carburetor upgrade. Manifold is set up with 4 barrel square bore bolt pattern. Replaces Marine Power 0017-275N11.