You will also have the option to bolt on another front mounted pulley(Three bolts/ARP stainless 12pt) for that supercharger or added accessory with a common three bolt pulley pattern. Our new billet hub and modified ATI balancer setup eliminates everything and we've twisted these to 7,000 rpm's without the thought of an issue and they are 2lbs lighter. The difference between a factory balancer and our ATI balancer on the dyno is totally night and day, silky smooth!!! The factory balancers tend to have a harmonic(vibration) or a pitch change starting sometimes as low as 5,000 rpm's. If you race or spin your 4.0 or 4.2 based Jeep/AMC engines above 5,000 rpm's then this kit should be on your wish list. We had to address our own issues and the Jeep/AMC community with the effects of upper rpm crank shaft harmonics and safety concerns with the only available options being factory replacement dampers. 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).
#Summit racing porting kit manual
Manual transmissions require clutch upgrade such as Mcleod or Centerforce.
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. This package will have all of our goodies such as: 1.7 adjustable roller rockers, 3/8" pushrods, billet valve cover spacer kit w/billet valve cover perimeter retainers, billet thermostat housing, ATI serpentine damper kit, slicked out paint color of your choice, intake block-off plate, water pump, copper intake/exhaust manifold gasket, stainless steel winged washer kit, 24lb injectors. With this package we can custom tailor the cam to suite your needs and bring the power in where you want it. "HIGH OCTANE" at 4.6 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. From the factory the original 4.2(258) started life around 100hp to eventually topping out around 190hp by the 4.0(242). To this point there has not been a hypereutectic option with a 6.125"(Long) rod option so we made one and created a new animal. 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 can not beat a well designed Hypereutectic for quiet operation, excellent long life, anti-scuffing and sealing ability.
We have done our research and developed an elite engine package that utilizes our custom made hypereutectic pistons and lightweight rings with the highly desired 6.125" (Long)rods, 10.5:1 compression with our newest designed competition head for this piston design.
For those who want the stoutest most reliable 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 "HIGH OCTANE" then this one fits the bill.
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