engines to achieve 10:1 compression ratio and lunati roller rocker arms p/n 84146 ... valve duration .050 244º rocker arm ratio 1.5 intake valve lobe centerline 107º ... mains zero-decked 10.0:1 compression ratio forged steel crankshaft lunati rods p/n ... great street/strip performance a rear axleratio of around 3.55 should be used a ...