[POWERSTROKE]

Dad had a '66 Buick Skylark, fancy Buick Special, 4 door coupe, with the 198 V-6, had the odd fire crankshaft, really sounded busy with a little RPM. Hooking that little V-6 to a Powerglide trans was a mistake, but with H78x14 snow tires it would run 70 easy in low. One often ignored problem with the odd fire engines was they were hard on timing chains & gears/sprockets. Bad harmonics from the irregular loads on the timing gears. Dad drove to/from work at odd hours of the night and day and the timing gear decided to pitch the nylon molded onto the cam sprocket about half way home one morning about 2:30. Was an ALL DAY event getting the car repaired, just made it back to work about 3-3:30 PM.
The Big Block V-6 engines being truck engines used more reliable gear driven camshafts. Can't say I've ever heard of a gear drive failing. Another unique feature was GMC putting the spark plugs inside the V of the engine, keeping the plugs away from the heat of the exhaust manifolds that typically glow orange hot while the engines are running hard. Heat doesn't effect the spark plugs but plug wires last many times longer.