These Oil through SBF lifters fit all 170/200/250ci engines with solid lifter camshafts. However they are required when using Yella Terra Full Roller Rocker arms. NOTE: Oil through lifters are included in the Yella Terra Full Roller Rocker Arm Kit.
Clay Smith Lifters exclusively, and for good reason. Clay Smith Lifters are a sophisticated, highly engineered, precision engine component custom manufactured to their demanding specifications. If you were to examine the inside of a Clay Smith Lifter you would see why they are the choice of mechanics and race teams around the world. No other lifter is designed, engineered, and manufactured to such exacting tolerances. Hence Clay Smith Lifters more accurately perform their primary function of maintaining precise valve timing under all engine operating conditions.