Question about 1970 Ford Mustang

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It has a 351 Windsor motor in it. I has a terrible knocking sound. We replaced the main bearing and timing chain. What could it be?

I have a 1970 mustang with a 351 Windsor motor in it. I has a terrible knocking sound. We replaced the main bearing and timing chain. It doesn't sound like it is coming from the can shaft. The knocking sounds like it is coming from underneath. Could it be the water pump or oil pump? Any suggestions on possible troubleshooting to find culprit?

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How were the rod bearings? I always check them whenever replacing the main bearings. Why did you only say "main bearing"? There are always more than one.

could also be part of the fuel pump dropping do into the oil pan is now hitting the crank, but you checked the oil pan for "bits and pieces" when you took it off to change the main bearing - right?

Posted on Mar 31, 2015

Testimonial: "Did not notice any pieces in oil pan. We have a replaceable oil pan gasket so we could check it."

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