Trick Flow Inside Valve Spring Locator - 0.053 in Thick - 1.550 in OD - 0.560 in ID - Black Oxide (Set of 16) RS003C0111W The 602/604 DUI is designed

The 602/604 DUI is designed specifically for these crate engines with two features that set it apart from our regular Racing DUI

Air Jack Mounting Ring

You'll also be able to set a 2-Step Rev Limiter

Manufactured from a super-strong composite material

The popular Saturday Night Special Torque Converter delivers premium performance at a reasonable cost

Trick Flow Inside Valve Spring Locator - 0.053 in Thick - 1.550 in OD - 0.560 in ID - Black Oxide (Set of 16) RS003C0111W The 602/604 DUI is designedProduct Description: Valve Spring Locator Inside 0. 053 in Thick 1. 550 in OD 0. 560 in ID Chromoly Black Oxide Set of 16 Trick Flow built their reputation on designing and producing power boosting aluminum cylinder heads for high performance engines, and have grown to offer a full range of performance parts and bolt on kits for nearly every aspect of the engine and drivetrain.