PRW 1546001 Ford 429-460, Prod Heads, 7/16" Rockerloc'S

PRW Billet Aluminum Stud Girdles Are Made From 6061-T6 Aluminum, Manufactured To Exacting Standards, And The Solution To Valvetrain Instability. PRW Stud Girdles Reduce Rocker Stud Flex To Retain Critical Valve Lash Adjustments. The Result Is More Accurate Valve Lift And Timing. PRW Stud Girdles Are Relieved At The Factory To Accommodate Crankcase Evacuation Components Without The Need To Visit Your Local Machine Shop. These Products Come Complete With PRW Poly Locks.Note: Fits Original Production Head Spacing Such As Scj Heads (Casting Dooe-R). John Kasse Heads And Similar Spacing Will Not Fit. Will Fit A429 Heads With 2.25" Intake Valves But Not The Later Version With 2.20" Intake Valves. Benefits/Characteristicscnc Machinedreduces Rocker Stud Flexanodized For Superior Finishmade From 6061-T6 Aluminumeasy and Quick Removal and Replacementmore Consistent High-Rpm Performancepre-Machined To Allow For Vacuum Pump Airflow