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Budget Roller Rockers [Archive] Ford Australia Forums. 38 Yella Terra CHECKING ROCKER GEOMETRY Rocker arm geometry in relation to the installation is critical. The roller tip should ideally contact the valve yella terra roller rockers fitting instructions 25/12/2009Â Â· I'm looking to run a set of Y/T roller rockers on an H.O Fit under a standard 4.0 valve here's a link to an article on Yella Terra rockers. Yella Terra Roller.