4G63 DOHC Premium Beehive Springs | Titanium Retainers KVS63-BTK-X rb alternator IRP has a worldwide network

IRP has a worldwide network of distributors who thoroughly test our products and distribute to consumers

Please view and understand the motor replacement procedure video before attempting to change the motor

Nissan RB26 Engine/Flywheel

When set up properly

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4G63 DOHC Premium Beehive Springs | Titanium Retainers KVS63-BTK-X rb alternator IRP has a worldwide networkInstall at 90lb seat pressure. Maximum valve lift 13. 50mm. MITSUBISHI 4G63 DOHC EVO 1 9. High Performance PACALOY Beehive spring and Titanium retainer set. Suits high RPM, high boost competition engines. Install at 90lb seat pressure. Maximum valve lift 13. 50mm.