**** Suits Yella Terra Alloy 12 port Head ~ bolt straight on ****

Part# YT5008 - Yella Terra racing roller rockers, stud mount roller set to suit all Holden red, blue and black six cylinder motors. The ultimate race set up, proven over many years is this race series roller rocker when installed along with screw in studs and push rod guide plates to give you full valve lash adjustment and minimal reciprocating weight in the strongest rocker arms available. For added valve train strength an additional stud girdle can be installed, sold separately. 7/16 UNC Stud mount with a rocker arm ratio of 1.6 : 1
 

Your heads may require machining for screw in studs and guide plates. Screw in studs and guide plates sold separately, note hardened push rods have to be installed when using guide plates. For use with mechanical or hydraulic camshafts.
 

NOTE: Standard heads that require machining for screw in studs ~ remove .320” from Rocker pads, drill and tap 7/16” UNC, then fit studs and guide plates, sold separately