Ultralite Roller Rocker Set 1.8 Ratio (8mm Mount, Shaft Bolt-On Non Adjustable)Ultralite Roller Rocker Set 1. 8 Ratio (8mm Mount, Shaft Bolt On Non Adjustable)Suit GM LS1,LS2,LS6 With GM, AFR, Edelbrock, World, TFS 215 & Dart 205,225 Heads YT6646 6646 Yella Terra Ultralite Yella Terra has developed shaft and pedestal systems for late model engines that have less than half the nose weight of other rocker designs to correct valve float when some performance camshafts are used with lightweight valve train components and conical