A single-row roller chain drives the OHC, which operates the canted valves through rockers on two shafts. The aluminum crossflow head has hemi combustion chambers, three cam bearings, and, of course, replaceable guides and seats. In our specimen, it propelled us from 0 to 60 in an unspectacular 13 seconds. By the way, the turbo pumps out 135 hp and the carbureted version 106. As you might suspect, a tune-up should be done every 30K miles, and begins with new plugs.
Idle speed is next.
With everything installed and all accessories off, run the engine at 2,500 rpm for two minutes, let it slow down, and look for 750 rpm. The recommended valve adjustment interval coincides with that for a plug change. With the engine hot, intake lash should be .008 in. and exhaust .012. While you're there, you might as well retorque the head bolts to 58 ft. lbs. Well, certainly, and easy to use.