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If it's a "K" code hi-po 289, then it has solid lifters and the valve clearance is adjustable. If a standard 289, then it has hydraulic lifters which are zero clearance and self adjusting, i.e. there is no adjusting screw on the rocker arm.
SOMETIMES IT IS CAUSED BY THE OIL USED! THE WAY YOU DESCRIBE IT SOUNDS NATURAL, BUT YOU MIGHT CHECK THE TAPPET ADJUSTMENT! ONE OR TWO MIGHT BE A FRACTION LOOSE! THIS IS EASY TO DO, BUT REQUIRES YOU TO REMOVE THE VALVE COVERS AND WIGGLE THE TAPPETS BY HAND! TOO MUCH FREE PLAY CAN CAUSE THEM TO MAKE NOISE! YOU CAN ADJUST THEM UP A LITTLE, BUT DON'T OVER TIGHTEN THEM, OR YOU CAN DAMAGE YOUR LIFTERS! CHECK YOUR LAST OIL CHANGE, AND IF NEEDED, YOU MIGHT CHANGE TO A HIGH MILEAGE SYNTHETIC OIL LIKE MOBILE ONE, IN A 10W-30! 10W-40 IS TOO THIN FOR THAT TYPE OF ENGINE!
You problem is most likely just lifter noise. This is common with a lot of Ford engines with self adjusting lifters. Although lifter noise is bothersome it doesn't pose a serious problem. Unless your engine starts to miss or your gas mileage drops way off lifter noise is just an annoying problem.
I would recommend that you add some Sea Foam Engine Treatment($6-$8) to your oil. This is not an oil treatment it's more of an engine cleaner. If this works you'll need to add it every 2nd or 3rd oil change.
If this doesn't take care of the problem then depending on your engine you may have adjustable rockers that would allow you to remedy the problem. If not, your options are limited to living with it or replacing the lifters and possibly other valve train parts.
You either have a self adjusting brake that is working real good, or the flexible lines going to the pump are capillary? Meaning it lets the fluid in but won't let it out. Sometimes it locks up solid and you have to walk home. There is no way to check this, just have to replace them. and then bleed the lines again. Before yo do that, check the self adjusters to see if they are on there right and not spinning free. Hope this helps.
Noise out of the engine. Noisy valves? Low oil level? Is the sound like tick, tick, tick, tick......that's how bad valves sound. I don't know if you have solid lifters those have to be adjusted after some mileage. Hydraulic ones are self adjusting. Only a good mechanic can tell for sure.
This car has hydraulic self-adjusting lifters - there is no mechanical adjustment. Go to the local parts store and get a can of Seafoam - pour half the can in the oil, drive 30-40 miles, and change the oil and filter. It's possible that oil sludge is preventing a lifter from pumping up. Seafoam is good at clearing that stuff out.
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