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I'm afraid it's bad news but I really hope not. Truck as 123k miles. My 302 has developed a tapping / knocking that is most noticeable when the engine is warmed up. I've ruled out the accessories since the noise is still there with the belt off, so I think it is something internal. We had a shop look at it who thought the noise was most prominent from the distributor area. They pulled off the valve cover on the drivers side trying to listen for the noise but couldn't find anything. They replaced the distributor thinking they fixed the noise, but when the truck was picked up, it was clearly still tapping away. Needless to say, we just took the truck home from the shop. I don't think it is the exhaust manifold either, doesn't sound like an exhaust leak. The noise is consistent with engine RPM up and down the range. We drained a quart of the oil and threw in a quart of marvel mystery oil a few days ago hoping that it will make it better. As for now, just driving it around town to work the MMO all the way around, but I'm not having high hopes. Any help would be great, and if need be, I can post a video of the noise.
Trying to diagnose noises over the internet is not ideal ... Would need high quality audio to even make a good guess. To add to it there's a distinction to be made; there are taps, rattles, knocks, pings, all kinds of ways these sounds are named. Best solution is an old geezer who knows engine noises to listen to it, probably not the same shop you were just at. If you're so inclined, remove the oil pressure sender and attach a mechanical
pressure gauge to the port, get pressure readings after a cold sit overnight and at hot idle and at 1500-2000 rpms. Keep in mind some of these old engines will run just fine on lower pressure than you'd think with no noises.
Hold the stick against your year and CAREFULLY touch it to the block/head/valve cover/rotating shaft location till you get the loudest sound of the noise and that will at least narrow down
the location.
Update on the truck, noise is still there unfortunately but better. Recently tore pretty much the whole top end apart (upper and lower intake, valve covers) and found a scarred rocker arm and rocker. Ordered a new set of lifters and just slapped em all in and put everything back together. After sorting a few goofy things out we missed once we put it all back together, the noise is still there but quieter. Poured Lucas Oil Stabilizer (man, thick like honey!) and the noise has quieted significantly. The first video i'm linking is to the noise we had before the lucas and the second video is a new noise that showed up only when the truck is very cold (Goes away basically when I start driving). Honestly just plan on driving it until she goes, haven't noticed any loss of oil, power, or anything out of the ordinary. I almost think the second video noise is the first noise but can't tell for sure. I also know its hard to diagnose noises over the internet but anything helps!
have you gotten to any of these test I don't think it is the exhaust manifold either, have you checked remove the oil pressure sender and attach a mechanical pressure gauge to the port, get pressure readings after a cold sit overnight and at hot idle and at 1500-2000 rpms Try the old broomstick/yardstick trick. Hold the stick against your year and CAREFULLY touch it to the block/head/valve cover/rotating shaft location till you get the loudest sound of the noise and that will at least narrow down the location compression check
have you gotten to any of these test I don't think it is the exhaust manifold either, have you checked remove the oil pressure sender and attach a mechanical pressure gauge to the port, get pressure readings after a cold sit overnight and at hot idle and at 1500-2000 rpms Try the old broomstick/yardstick trick. Hold the stick against your year and CAREFULLY touch it to the block/head/valve cover/rotating shaft location till you get the loudest sound of the noise and that will at least narrow down the location compression check
Exhaust manifold is fine, no exhaust leaks. Waiting on a gauge to test the pressure but that’s next on the list. We have a mechanics stethoscope (enhanced broomstick) and it seems to be coming mostly from the cylinder 7 / 8 area but it’s hard to tell. Compression tested great, much better than before we pulled everything apart. Thanks for all the help!
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