HKS capacity upgrade for the VR38DETT engine, increasing displacement to 4,255 cc with a 99 mm stroke while retaining the standard 95.5 mm bore. Developed to increase low-speed torque in street-focused engine builds.
FITMENT Nissan GT-R (R35) — VR38DETT engine. The matched internal components must be used together.
SPECIFICATIONS
Part number: 21004-AN019
Displacement: 4,255 cc
Bore × stroke: 95.5 × 99.0 mm
Piston pin: 23 mm
Listed compression ratio: 8.6:1 with a 0.8 mm gasket
INCLUDED Billet piston kit, STEP3 H-beam connecting rods and billet crankshaft. The kit uses dedicated piston-cooling oil jets.
INSTALLATION NOTES HKS lists no bore/hone or full-floating pin conversion requirement. This remains a complete engine-build operation: follow the kit instructions and verify clearances. HKS recommends VR43 crank damper pulley 24998-AN001. Engine output and durability depend on the complete specification and operating conditions.
