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Under the hood, H&M replaced the stock 4.0L with a big GM LS-1 5.7L V-8 engine pushing 475 horsepower and 490 lb-ft torque. A few of the internal engine components include Patriot heads, Crower cam and forged Manley pistons. The truck also uses an oversized PWR radiator, Bosch fuel pump, RPM headers and RPM exhaust. Fuel is contained in a 52-gallon Harmon fuel cell.