Stock replacement non-oiling FE hydraulic lifters fit all 170/200/250ci engines with adjustable or non-adjustable rocker assemblies.
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.
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My son and I Installed a rebuilt stock head along with the Clay Smith non-oiling hydraulic lifters on his 1965 Mustang 200 ci engine. They were an exact fit, and after about 200 highway miles, no problems. The price was very competitive with my local parts store, and the fit/finish compared to the parts store lifters I removed appeared to be a notch above OEM. I didn't remember the last time we installed the push rods, but these lifters seemed to "click" better than the OEM to let you know the push rod is in the correct spot.