The Stage IV (Street Ace) is our most popular performance package for one reason, It Works! This street proven package offers rock solid horsepower and torque and phenomenal acceleration. So, unlock the full potential of your Twin Cam® engine and let the fun begin!
R&R Stage IV (Street Ace) Headwork. (Exchange)
CP® Forged Pistons
R&R 615 Gear Drive Cams
S&S® Gear Drive Kit
Pushrod Tubes and O-rings
Head Gaskets & Base O-rings
Cam Cover Gasket and Support Plate O-rings
Rock Box Gaskets for Stock Rocker Boxes
Note: Ship your stock cylinders with your stock heads and we will properly size them to the new pistons in the kit.
Note: 06 Dyna® and 07 & later T.C. also include an R&R billet support plate.