picture this, new girlfriend, I say hey lets take the old truck out to dinner. Well, we get going, about 2 miles from the house, and BANG, dead, nothing, couple of pops while cranking. fast forward, broken timing gear. Seems that the stock one had a set of nylon or plastic teeth on the aluminum cam
Gary, when the chain falls off it doesn't run long enough to get starved on oil and do any damage. It stops running instantly! He can check the pistons since the heads are off.