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K3500

Hi, thanks for writing in. This sounds like a bad fuel pump (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-fuel-pump) and or bad fuel filter (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-fuel-filter). The hard start may be a low fuel pressure cold causing the hard starting. Have the pressures tested and leak down...

Your motor (454/7.4L Big Block Chevy) should have an oil pressure sending unit that is typically mounted just above the oil filter housing. This is a relatively small unit (about the diameter or a quarter or slightly bigger) with threads...

I would recommend pulling the cylinder heads off to inspect considering 2 of the push rods broke. This may have caused material from the broken rods to be scattered throughout the valve train or potentially other places in the motor....