New guy here... My 98 Chevy 454 bb Has a ticking sound coming from passenger side of block; Maybe a stuck lifter? Got a new Jasper motor a few years ago and only has about 40k on new motor.
Already changed the oil about 3 times, using ATF and Marvel Mystery Oil, drove truck hard intermittently for about 50-75 miles, but still ticking.
Any other advice or suggestions y'all have before I have to go to a mechanic? Thanks!

Ticking coming from down in this area where I am pointing.

 

Likely a bad lifter. I'd pull the valve covers off and redo the rockers. More then a full turn is beyond normal clearance. You might get a vehicle stethoscope to track it down. Run it too long as is and you can damage a cam lobe.

 

Thanks! I was afraid of that, as I'm not very mechanically inclined. Guess I'll have to take it to the shop.

 

Welcome to the forum. Moving to the Silverado section of the forum where you will get more views.