Thnx. Lack of oil is what I am scared of since the knock started. I was waaaaay more careful IMO than anyone here not to drop anything when lower intake was off, so my guess is there was/is a mess of a sludge like it was under upper intake.That is lack of oil damage. Most likely the lifter is not letting oil thru to the pushrod, Install a direct pressure gauge to check the oil pressure. Replace the pushrod and the rocker arm. Pull the intake check the camshaft lobes for wear and that lifter in particular. The early roller blocks used to let a lifter go sideways once in a while
I may have disturber things further when I lifter engine by back of the oil pan to change engine mounts... only question is why is the oil pressure still okay?!
Dropping the oil pan to be done.
Anyways, apart from manual - on stock gauge on cold start I have one line above middle of gauge. On warm idle it drops to first white line above red. It goes up with revolutions. I know it should be a simple on/off switch, but eitherway it moves and showes pressure change. Just not as fast and precise as manual gauge.
Few times I saw needle when letting the throttle off to brake with engine that it sink, but I never saw it below first white line since I got the car.
Regarding pushrod and rocker, they are the original ones I have on shelf. There are new ones in, accompanied with a new lifters and rocker bolts.
Question was only in a sense to avoid such a damage of new parts...
When checking valvetrain before lifter change (two weeks ago) with running engine and valve covers off, I saw some 20-30 seconds of dry run then oil started to seep thru pushrods....
Last time we checked pressure on oil tap by filter it was okay and within spec. That wories me... if it would drop things would be clear....Check the oil pressure with a direct pressure gauge. Use the tap near the oil filter. There is no test for the oil filter bypassing. You can cut the filter apart and check for sludge. The oil pump pickup tube is what will be plugged if the silicone oil pan gasket deteriorates. The silicone chunks will make it to the filter and be trapped. Real common on 2.3 Mustang and Rangers. Car will have little to no oil pressure and will be okay after replacing the pickup tube. If you can't find a new pickup tube in Croatia, then clean it out. Just cut the screen off clean the tube in solvent and re weld the screen.
Filter was cut and there was pretty good amount of sludge.
It was planned for this winter even if the car would run perfect: I have waiting in my garage on stock from rockauto: melling oil pump, oil pump shaft, new oil pan, new oil pickup tube, felpro blue pan gasket, new oil pan bolts...
Thnx but - no. Two weeks ago I had lower intake off for second time this year to throw in FRPP lifters. Cam lobes were shiny and okay, actually everything what we checked did look okay.All the 302 roller engines can have a lifter break a dog bone and ride the camshaft sideways. I've seen it a few times. Happened to me on my 347. Didn't really over rev it either. Wiped the camshaft and destroyed the lifter. My push rods and rockers were all OK. Happened on just one lifter.
It was years ago and the machine shop blamed it on Royal Purple synthetic oil. Synthetics got blamed for everything back then.
Found just one pushrod and rocker with some wear (cyl2, exhaust, pictures above), and was lucky as dog I found issue and knock source, but it was not.
It may be in my head now, but I may had a feeling that oil needs a lot of time to get to lifters upon first start after new lifters (of course I primed engine also, and additionally cranked engine for 2 minutes before real start just to be sure).