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540512   454 CHEVY  2" ALL STAINLESS LOW PORT/ HEADER 33" OVERALL WIDTH                                                                                                             

Our 540512 All 316L Stainless Steel Mercury header is basically the same as our 540505 All 316L Stainless Steel Mercury  header except for the overall width, which is 33". Designed with a narrow overall width for tight motor box configurations or for twin engines applications. A short or angled valve cover must be used. This header must removed to adjust valves. This Low Port fresh water header incorporates a 2" primary tube (1 7/8" I.D.)  This header will adequately handle engines up to 572 cubic inches.  This Header usually replaces Merc exhaust where their is a  "S"  bend  or  2   90deg elbows after the manifold.  The Header can also be used for other boats where the engine is very close to the transom and the exhaust port height is near crankshaft centerline.   The header points down 75 to 90 degrees.  This Header usually exits below the water line so reversion should be considered.    Keep in mind, when  exhaust tips are below the water line, the header can literally pull water up from outside the boat.

Camshaft selection is very important to guard against reversion.  Lightning has many camshaft and lifter options from mild to wild.  We also have dry tail pipe extensions that can eliminate reversion completely.

The standard Header comes with a black powder coat finish; optional colors available. The headers come complete with water supply manifold, gaskets, bolts, pet cocks, water feed hose and clamps.

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