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540325   454 CHEVY  2" MERCURY SILENT CHOICE HEADER (FRESH WATER)33" OVERALL WIDTH                                                                                                            

Same as our 540324 Mercury Silent Choice Header but it's only 33" in overall width for twin engine applications. This Mercury fresh water header incorporates a 2" primary tube (1 7/8" I.D.)  The 2" primary tube header has been Dyno tested with our 632 cubic inch Chevy test engine with outstanding results.  For more info click here.  The standard header outlet points to the stock Mercury location at the transom. This header is the most susceptible to reversion because of its short collector.  It should be noted that the opening size of the port that runs through the gimbal housing to the propeller is 2" X 2 3/4".  So if a high horsepower or large cubic inch engine is used, the Silent Choice valves can only be closed at low RPM. 

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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