A good way to see if the timing chain is stretched out is to put a ratchet on the crank and with the distributer cap removed rotate the crand back in forth really slowly. If the crank moves and the distributer has a delay before it moves your timing chain is worn.You could also pull the cover and take a look at it. Most the time when main bearings or rod bearings are worn the oil pressure will drop a little or a lot. If you really want you could pull the pan and plastic gauge the main bearings.
How many miles on it?
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