Having some trouble with my 5.2 Magnum - Lifters

[Just Carbs]

I've had 5 magnum engines long term. Still have 3 of them. With a collective mileage of 800k miles. The lifter train has proven to be very durable and quiet.
Only 4 lifters have ever made any noise at cold overnight start up. And that was short term.
Two others developed a full-time tick, hot or cold.

Here is my recipe for the cure.

Remove the rocker arm.
Pump the push rod "many" times to exercise and empty the lifter.
Rotate the engine so the lifter is on the heel of the cam to expose the lifter oil inlet ring to the oil galley.
Pump the pushrod again.
Pour lacquer thinner down the center of the pushrod in an attempt to fill the lifter with the lacquer thinner. I use an oil squirt can with a rubber tip.
Blow 100 psi air down the full pushrod to completely fill and rinse lifter.
Refill the lifter, let sit. Hours, days, weeks.
Repeat. Hours, days, weeks.

The objective is not only to clean the lifter, but to also clean the passage feeding oil to the lifter without treating the entire engine with the very effective but aggressive lacquer thinner.

 

[tallhair]

Here’s the video

 

[tallhair]

I've had 5 magnum engines long term. Still have 3 of them. With a collective mileage of 800k miles. The lifter train has proven to be very durable and quiet.
Only 4 lifters have ever made any noise at cold overnight start up. And that was short term.
Two others developed a full-time tick, hot or cold.

Here is my recipe for the cure.

Remove the rocker arm.
Pump the push rod "many" times to exercise and empty the lifter.
Rotate the engine so the lifter is on the heel of the cam to expose the lifter oil inlet ring to the oil galley.
Pump the pushrod again.
Pour lacquer thinner down the center of the pushrod in an attempt to fill the lifter with the lacquer thinner. I use an oil squirt can with a rubber tip.
Blow 100 psi air down the full pushrod to completely fill and rinse lifter.
Refill the lifter, let sit. Hours, days, weeks.
Repeat. Hours, days, weeks.

The objective is not only to clean the lifter, but to also clean the passage feeding oil to the lifter without treating the entire engine with the very effective but aggressive lacquer thinner.

Can you tell anything from the video?

 

[Just Carbs]

No, I don't think the video is keeping up with the valve movement. They all look like they are misbehaving.

Your oil is dirty.
Change the oil and filter. Then, put the engine degreaser (brand of choice) in it. Leave it in for about 10 minutes at idle, let it sit for hours, idle sit, idle sit, idle sit..........., then, change the oil and filter again of course.
I use a quart of diesel fuel. I'm not recommending it, that's just what I use. If it's a very dirty engine (hopeless case) I use a quart of lacquer thinner, works wonders. I've never hurt an engine or any seals with either one.

If the engine is reasonably clean, but the valves are randomly sticking from carbon, I use a gallon of lacquer thinner and a quart of outboard motor oil ----IN THE GAS TANK---and drive it till it's gone, all of it. Repeat as needed. It gets delivered to the valve guides with the intake charge. The thinner cuts the crud on the guides AND the underside of the valves, and the oil lubes the guides so the thinner don't seize up the valve in the guide. The carb accelerator pump, fuel line and fuel pump don't like it sometimes, they swell up, but that's small potatoes for not pulling heads.

If you put your hand on each rocker arm while the engine is running, you will feel it if that lifter is collapsed.

If you put a timing light on each valve while the engine is running, you will see it if that valve is sticking.

If you press on the side of each valve while the engine is running, you will hear a worn valve guide stop ticking.

 

[68PK21 440.6bbl]

Here’s the video

That sounds fine to my ears with headphones on... your beating yourself up on this, it's a 15 year old daily driver vehicle, get it out on the highway for a long trip/run... it'l do wonders for the motor. That's what I did when I got my 1968 Fury III 4dr sedan for $100 in 1973, I'd been driving past the car for many months looking at it sitting in the driveway with brand new studded snow tires since August with no tags on it. Turns out it was a old salesman's fleet car that was a coworker of a motorcycling friend of mine, long story short I tossed a battery in it and upon starting the over 100k mileage very little maintained 318 it was lifter rapping to which I said to the owner "That's bad" and sealed the $100 deal on a 1 small dent bodied 6 year old car. Next month I had to take my paid 2 week vacation before the end of the year which I stretched into like 3 weeks paid due to the Christmas holiday falling on a Thursday... off we go in the Fury on a non-stop drive to Daytona Beach Florida with a fresh oil change/tune-up/hoses & belts plus my 15" Michelin radials wheels off my 1968 PK21, lifter noise was gone by the time I reached the Georgia gas fill up.