Nitrous Oxide 0.500 Polished Billet Square Bore Perimeter Injection Spacer Plate These Speedmaster rear main seal

These Speedmaster rear main seal adapter kits are designed to install an early 2-piece style crankshaft into a late model

Gain 25-35hp with this direct replacement

Other features include a flush mount

Speedmaster aluminum LS valve covers will give your LS series engines a totally new look

Nitrous Oxide 0.500 Polished Billet Square Bore Perimeter Injection Spacer Plate These Speedmaster rear main sealThese Speedmaster perimeter plates employ multiple injection points to ensure that a perfectly atomized, cylinder to cylinder balanced blend of fuel and nitrous reaches your engine. The technology eliminates nitrous delivery imbalance, the major drawback with spray bar type nitrous systems. The plates are manufactured from aluminum and are anodized for protection.