HKS 23011-AN023 Short Block VR38 4.3L STEP Pro+ for NISSAN GT-R (R35)
This item is considered special order and is not available for immediate pickup or dispatch. Price and ETA may vary. Please note that no returns, cancellations, or refunds allowed on special orders.
VR4.3L STEP Pro + short block is strengthened for stages that require even higher torque
Concept
Capable for high torque, the VR43 STEP Pro+, contains special designed I-beam con-rods which have a high buckling strength compared to the H-beam con-rods. In addition to the specifically designed crankshaft and to further enhance the torsional rigidity. The pin diameter have been enlarged, and by adopted an asymmetrical design, the cross sections between pins #5 and #6, where stress is the highest, have been reinforced. In response to the increased weight of the pin section, the counterweight was redesigned to improve the balance ratio
Features
- As with the STEP Pro, the material for the crank is made of high-end racing grade nitriding steel. Exclusively for the STEP Pro +, the crank is treated with ion nitriding, which increases surface strength and toughness that are required of high cycle performance crankshafts.
- By increasing the inside corner radius to 3.5 and enlarging the crankpin to D57, the structural torsional strength is improved.
- The newly developed, billet I-beam con-rods improves bucking strength by 26%.
- The front end of the crankshaft is extended 10mm to prevent crank pulley fretting.
- Designed specifically for the STEP Pro+, the pistons are coated with a special double layer coating, which is effective for both high-load and high-speed sliding.
- HKS original oversize main stud bolts are used
- Chrome Molybdenum is used to create the #2 and #3 journals to increase durability.
- Line boring process is done to ensure the roundness of the main journal
- The main bearing and connecting rod bearing were selected after numerous tests.
Specifications
| HKS 4.3L | Stock | |
|---|---|---|
| Bore | 95.5mm | 95.5mm |
| Stroke | 99.0mm | 88.4mm |
| Compression Ratio (t=0.8) | 8.6 | 9.0 |
| Allowable Rotation Speed | 7,400rpm | 7,000rpm |
| Displacement | 4,255cc | 3,799cc |
SHORT BLOCK VR38DETT 4.3L STEP Pro+
Block Modifications:
- #2 and #3 Chrome Molybdenum Cap
- Relief of crank interference parts
- Large Main Bearing Screw
- Enlarged ladder cap hole
- Journal oil hole line boring
- Honing
Main Bolt: HKS M12 Stud Bolt (625+)
Piston: HKS Billet (Double-layered molybdenum coating?
Connecting Rod: STEP Pro+ Billet I-Beam
Oil Jets: STEP Pro+ 3D-Printed
Crankshaft: STEP Pro+ HKS Billet (Nitride steel & ion heat treatment, D57 crankpin enlarged, enlarged R fillet, extended damper mounting area)
Main Bearing: ACL
Connecting Rod Bearing: ACL (Width Adjusted)
Crank Pulley: Original VR43 Damper