Over time all internal engine wear surfaces become worn. This is true for crankshaft journals, connecting rods, camshaft lobes, piston rings, bearings, etc. When rebuilding a worn out engine youll need to replace them all in order to regain the engines original performance. And, lets face it, Jeeps need all the power we can get. Omix offers new high quality replacement engine parts to get your Jeep back on the road. This replacement rocker arm shaft fits 52 - 71 M38A1, 53 - 67 CJ3B and 55 - 71 CJ5 CJ6 models equipped with the 134 ci F - head engine. Sold individually - one required per vehicle. Replaces OE 805368