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Each component is balanced within +/- 1 grams and the crankshaft is spin balanced to within. All of our rotating assemblies are balanced on our Hines Dominator custom built balancing machine. Each valve job is done on our Berco cylinder head machine and flow tested on our Saenz flow bench. They are the strongest aluminium rocker arms in the world with deflection and bend tests proving their aircraft grade extruded aluminium arms superior to rival aluminium and stainless steel arms. From there we go to our Rottler F68A CNC machine, where we true the bell housing face, parallel square deck, bore, and stroker clearance (when required).Once the blocks are completed at the Rottler they go to our Sunnen CK-10 cylinder hone, where the block is finish honed to specification and checked with our profilometer. Rocker Arm Kit - Ultralite - Shaft Mount - 1.80 Ratio - Roller Tip - Aluminum - GM LS-SERIES - Kit YELLA TERRA Part YTR-YT6670 More Details. The GM blocks start by going to our Peterson Align hone where every block is machined within specs. When Yella Terra bolt on rockers are used, the conversion can be performed in the vehicle with no head removal or machining required. Yella Terra's shaft-mount rockers are an easy and economical way of boosting power, torque and reliability in late model engines. Yella Terras shaft-mount rockers are an easy and economical way of boosting power, torque and reliability in late model engines. These motors all start with quality new GM blocks. Yella Terra LS3/L92/L99/LSA/LS9 Non-Adjustable Rocker Arms Set of 16. Here at CNC-Motorsports we strive for customer satisfaction on every engine. Clutch Cover & Pressure Plate Bolt Kits.Automatic/Manual Transmission Pan Bolt Kits.