"HIGH OCTANE" Jeep 4.6-4.7 Stroker Engine Package
For those who want the stoutest most reliable 4.6-4.7 liter street Jeep stroker available on the market that still retains factory manners and dependability as long as you don't mind running premium octane fuel hence the name. We have done our research and developed an elite engine package that utilizes our custom-made 14cc dish hypereutectic pistons and lightweight rings with the highly desired 6.300" custom A-beam connecting rods, with 10.0:1(66cc open chamber), 10.3:1(63cc closed chamber).
You may ask why Hypereutectic pistons and not forged? For a naturally aspirated engine that see's daily driving and hot rodding in all types of weather you cannot beat a well-designed Hypereutectic for quiet operation, excellent long life, anti-scuffing and sealing ability. To this point there has not been a piston option made with a 6.300" length connecting rod, period. We now have our hypereutectic piston and 1.2/1.5/2.5mm moly ring pack option with a 6.300" rod option and created a new animal. From the factory the original 4.2(258 w/5.875" rod length) started life around 100hp to eventually topping out around 190hp by the 4.0(242). "HIGH OCTANE" at 4.6-4.7 liters is another animal all together, on our dyno this package pumped out 366hp and 373ftlbs of torque with one of our less aggressive cams. With this package we can custom tailor on of our billet roller cams and hi-rev Morel roller lifters to suite your needs and bring the power in where you want it.
Now, for those that want the strongest available rotating assembly, we now have an all forged rotating assembly. Which is an option and features 2618 Forged JE custom pistions 1.2/1.2/2.5mm, 6.300" A-beam rods w/ARP 2000 bolts, our custom 3.895" fully counter weighted and fully machined custom crank.
Recommendations: Intake/Intake/Intake did we say Intake, to totally utilize this package we recommend an extremely ported stock intake manifold or custom setup(Sheetmetal) with an oversized throttle body(These are not mandatory items just recommended), header with 3" collector and a custom tune is MANDATORY with 91 octane minimum. Manual transmissions require clutch upgrade such as Mcleod or Centerforce. Automatic transmissions say a prayer then prepare for a moment of silence unless built or shift kit(Except AW4's, if they are healthy they seem to hold up well).
***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 3-4 months on build time as of 06/22/26