Chas If your
oil pump picked up something and locked up the
oil pump the pin should give first. You should pull the pan down and check that
oil pump. Pins don't break just because. I run a HV-HP oil pump with 100 psi spring in the pump. On startup I pin the gauge to 120psi. 7 years of racing and have not broken a pin. I am not lucky. I have a MSD distributor and FFP oil pump drive
shaft. Check the oil pan plug ( hope it is magnetic) and see if there is any metal chips on it. If so, pull the pan. Pulled the pan is better that wasting a 15G motor with a quick fix. Rick Lake