Top of the line STEP Pro+ added to complete engine vr4.3L. The VR4.3 STEP Pro+ is capable for even higher torque, a special I-beam con rod was developed that has higher buckling strength than the h-beam con rod. In addition, specially designed crankshaft to further increase torsional rigidity. The area of the dangerous cross-section is enlarged by larger pin diameter, and the asymmetrical design of the critical section between #5 and #6, where the stress is the highest, is thickened only. This minimizes the increase in weight and optimizes the balance ratio by reviewing the counterweight to match the increased weight of the pin section.

Features:

• Crankshaft of nitride steel for improved durability
• Larger crank pin radius for improved torsional strength
• 10mm longer crank front to reduce fretting
• Upsized HKS originally designed main stud bolts
• 2nd and 3rdMolybdenum journal for extra durability
• Line boring to ensure journal roundness
• Improved valve heat transfer, beryllium valve seats, phosphor bronze valve guides
• Double layer coated piston is specifically designed for Pro+ effective for sliding under high loads & rotation
• Special 3D printed oil jet to fir the I-beam connecting rod
• New billet I-beam con rod for STEP Pro+ made from a single piece of flat forged steel has 26% higher buckling strength

*Notes

• Doesn't include intake plenum, exhaust manifold, fuel system and other auxiliaries
• HKS recommends using HKS Racing Pro 10W50 Engine Oil