Jeep AMC 4.0 4.2 Stroker (87-06) Direct Replacement ATI SFI Approved Harmonic Six Rib Serpentine Balancer Kit
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. 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. 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. 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. 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. Your kit will include: Pre assembled six rib serpentine balancer/damper with tapered flat head stainless bolts, (3)12pt Stainless ARP bolts(Added pulley option), black plated billet hub keyed and indexed to the factory zero timing mark(No more guessing on timing with 360 degrees of timing marks on the damper), Crank bolt(Reuse your factory thick washer), extreme pressure assembly lube, blue and red locktite with full assembly instructions. ***This listing is for SERPENTINE BALANCERS ONLY, not v-belt balancers.