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Short block VR38 4.3L STEP3

Short block that includes the VR38 4.3L Capacity Upgrade kit

・Expected use scenes: Street
・Assumed torque: ~ 1000 N∙m

The assumed torque came from the in-house test data. We do not guarantee the use of the product without any damage.
Please note that the allowable torque may vary depending on the specifications of a vehicle, road surface conditions, driving conditions, travel distances, and so on when using the product on the actual vehicle.

  • Employing the HKS original main stud bolt with upsized thread.
  • The process for upsizing the thread of the block.
  • Line boring processing was performed to ensure the roundness of the bearing journal while maintaining the increased axial force.
  • The most appropriate main bearing and connecting rod bearing are used after many tests.
  • Reduce torsion vibrations by using the provided crank damper developed only for VR43 engines. (Accessory part)

It improves the driving comfort on the street by significantly increasing the low-speed torque by assuming the street use.
For users who often drive on the circuit or high-power drive, HKS recommends the following product.

COMPLETE ENGINE VR38 4.3L STEP Pro　→　Detail

COMPLETE ENGINE VR38 4.3L STEP Pro+　→　Detail

  • HKS crank damper only for VR4.3L
    (Cooperatively developed with ATI PERFORMANCE PRODUCTS)

  • Billet piston using A2618 material with high high-temperature strength.

  • Connecting rod bearing superior to the load capacity to improve the durability at high torque.

  • The billet crankshaft reduces torsional vibrations, weight-saving, and high-response performance using the high-efficient counterweight.

  • Increasing the axial force by using the main stud bolt with an increased size thread.
    It also ensures the roundness of the bearing journal by line boring.

Specifications

  HKS 4.3L Stock
Bore 95.5 mm 95.5 mm
Stroke 99.0 mm 88.4 mm
Compression Ratio (t=0.8) 8.6 9.0
Allowable Rotation Speed 7,400 rpm 7,000 rpm
Displacement 4,255 cc 3,799 cc

SHORT BLOCK VR38 4.3L STEP3

Block Modifications Provided the clearance for the crank
Increased the main bearing screw size
Enlarged bore and counter boring in the ladder beam bearing cap
Main bearing journal line boring
Honing
Main Bolt HKS M12 stud bolt (625+)
Piston HKS billet, Molybdenum coating
Connecting Rod HKS H-beam
Crankshaft HKS billet
Fillet weld WPC treatment
Main Bearing ACL product
Connecting Rod Bearing Stock, WPC treatment
Crank Pulley HKS product for VR43
SHORT BLOCK

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