"300HP" 4.6-4.7 Jeep/AMC "Stroker" inline 6 cyl engine package.
The "300HP" 4.6-4.7 liter is our entry level engine package and they normally make between 290-320hp/320-340tq with an excellent power band from idle to redline. All of our engine packages are custom hand built to spec, work well both Fuel injected or Carbureted. These engines are all upgradable with additional available options from below.
This package has a factory iron head with hardened valve seats that have a competition valve job with a full bowl blend, Rollmaster double roller timing set, custom hydraulic cam kit, stock stamped steel rocker arms with a stock valve cover and stock harmonic balancer. Compression will be 9.9:1 and it will work on regular pump gas. Your tuning will dictate what octane you will need to run to avoid detonation issues
*Recommendations for upgrades- Walbro 255 fuel pump, 24-36lb injectors, upgraded header w/2.5" collector and exhaust minimum!, intake porting, bigger throttle body, upgraded radiator, upgraded motor mounts(Drivers side mount that bolts on the block MUST have increased bolt count over the factory three bolts to keep from breaking block from added power, passenger can stay stock), cold air intake and last once everything is upgraded have it properly custom tuned then everything and everyone is happy. Every motor is dynoed with a video and power numbers. All engines will be shipped bare unless our custom high quality custom paint option is applied from the options list.
***Every single engine that is built and sold through Newcomer Racing(least to most expensive) has the minimum following items performed during the build process: All Blocks are Ampro baked and SS shot blasted, magnufluxed, deburred, bored and torque plate honed, line honed, decked for proper quench, full rotating assembly balancing, every single bearing is checked and set to size, cam and lifters deburred and polished, heads resurfaced, guides honed to size, competition valve job, spring install heights set accordingly, cam preload or lash set, high zinc break-in oil used during the engine dyno session, new break-in oil installed before it ships to your location.
***Engine builds once order is placed are running between 1.5-2 months on build time as of 04/01/25