HKS 4.3L Stroker Kit VR38 Step Pro BCD – R35 GTR

Brand: HKS
Product: Capacity Upgrade Kit 4.3L Step Pro BCD – R35
Part Num: 21004-AN024

SPECIFICATIONS:

• The crank for STEP Pro changed the material to nitride steel and treated the surface with ion nitriding to improve durability by enhancing the surface hardness and hardened layer.
• Expand the R-corner of the fillet weld in the crankpin to improve the torsion strength.
• Prevents fretting by extending the crank nose 10 mm longer.
• The counterweight employs an asymmetric shape to be compatible with the torsion strength and the response.
• The tungsten is used on the counterweight to achieve the balance rate improvement and response.
• Pulley mounting part that extended 10 mm and　highly efficient counterweight using the tungsten.
• Expand the R-corner of the fillet weld in the crankpin to improve the torsional rigidity of the crankshaft
• The connecting rod with a clearance shape to avoid contact with the enlarged R-corner of the fillet weld in the crankpin.
• An asymmetrical crank having an increased thickness counterweight #8 for increased torsional strength.
• Reduced weight for counterweights #2 and #5 to improve response.
• The billet piston uses A2618 material with high-temperature strength.

Piston Bore (mm): 95.5
Stroke (mm): 99.0
Pin Bore (mm): 23.0
Displacement (ml): 4255
Max Recommended RPM: 7400rpm

PRODUCT NOTES:
– Block milling required