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The car is a 98-z with FULL BOLT ONS. I just put an entire new valetrain upgrade with 224 cam with a 581 lift. Whats the cost to repair or should I start saving for that 427 motor?
Could be numerous things. It might not be a rod.
Check all of the valve train and then look in to lifters and then the bottom end.
Change your oil after you look at the valve train and look carefully for any debris in the oil.

