VR38DETT 4.1 Stroker Kit

The Tomei VR38DETT 4.1 Stroker Kit is engineered to significantly enhance the performance of your Nissan GT-R by increasing engine displacement to 4057.1cc. This comprehensive kit features a precisely balanced crankshaft with specially shaped counterweight edges and incorporates an X-type 2-line oiling system for superior lubrication and reliability under demanding conditions. Their thin ring design minimizes friction, contributing to overall efficiency, while their compatibility with both standard and 1mm oversized valves offers flexibility in build configurations. The pistons also feature optimal oil jet clearance for enhanced lubrication. The kit also contains H-beam connecting rods, a proven design known for its strength and rigidity. These rods feature a gradually slanted design and are equipped with large diameter dowel pins. For maximum lubrication of the piston and cylinder wall, two oil ports are strategically placed on the piston side of the connecting rod. High-tensile ARP L19 bolts are provided to secure these robust components. Specifications include a bore of 95.50mm (stock) and a stroke of 94.40mm (stock +6.0mm), resulting in the increased displacement. The C.C. volume of the combustion chamber is 62.5cc. Compression ratios vary depending on the piston dome volume and head gasket bore, with options including 9.38:1 or 9.23:1 using Tomei pistons with a 0.8mm or 1.0mm head gasket bore respectively. This stroker kit is designed for the 2009-2021 Nissan GT-R. The package includes the crankshaft, pistons, connecting rods, pins, rings, and clips, along with ARP connecting rod bolts.