The Engine Masters Challenge is a competition that for the last five years has brought builders together from around the country. Each strives to have the highest average horsepower and torque between 2,500 and 6,500 rpm. As in any contest, there are rules and specifications for these engines. The rules require the factory bore and stroke, with a tolerance of plus .035 inch, and plus or minus .015 inch, respectively. An aftermarket OEM-replacement cylinder head, a flat-tappet camshaft, and OEM-style intake manifold must be topped with a 14x3-inch air cleaner. To keep this more a battle of the builders and less of the manufacturers, several modifications are left for the contenders to perform. Custom camshaft grinds are allowed, as well as extensive porting to the cylinder heads.
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