Ide just leave the motor as is. From what you’re saying it runs fine. Although a total rebuild would make for some great videos. Lol. I’m assuming many of us have FE’s that need work. Food for thought. Len from Michigan.

From Australia, once we could check the tune on the motor by the colour of the plugs after a long run. Fuels have changed over the years here and the 98 octane I run in my Stang , well you just can’t read the mixture by the colour anymore, no matter what you do, it’s always the same colour, it’s just what the fuel does these days. Love your work guys!

This was a really good one guys. Learned sooo much! Beer...yup...beer.

Do a basic refresh on it and it'll still be on the road after you've left the earth. FEs aren't difficult if you know what you're doing. I have never broke bolts on an FE other than exhaust manifold.

Awesome video 🏁

I liked that last idea of trying to retorque the head to see if that will bring that cylinder right back around… otherwise if youre stuck having to pull the engine, you might as well throw some upgrades to it like a top end kit 🤷🏽‍♂️ but thats just my opinion

Pressure test the cooling system using a MityVac (IMO, a must-have tool for lots of things automotive). Don't overpressurize the system (maybe +10% over nominal spec)... don't want to blow a gasket. What to do next depends a lot on whether you actually do have a coolant leak into the cylinder (might explain the low compression number; albeit, the "wet test" on the cylinder does seem to indicate rings...

Carb tuning . Mirror and a timing light looking down the primary carb bores. Bring up rpms slowly till you see fuel trickle from the primary boosters. Note that rpm on the tachometer. Look at air fuel ratio with a narrow or wide band air fuel ratio display. If its lean. Increase the idle feed restriction 0.001" and try again. If its rich. Add a thin bristle from a wire brush. Retest.. Test primary jetting at around 3500 to 4000 rpm ..

I have driven and rebuilt every kind of ford engine you can think of. The 390 is like a 429. They run hurt for years. Until it starts fouling plugs, leave it be.

It’s not too bad, start working on the Galaxie 500!!! 🏁

Rebuild please! I really need the info.

I read my spark plugs and they told me to add 200hp. R.I.P. bank account

As a fellow F250, 390 fe owner, let’s pull it and overhaul it. Great video option!!!!!!!

Like anything, it's not going to get better I'd you leave it, but, you can monitor the rate of decay. I say, if it gets markedly worse, then you're going to have to do roughly the same level of effort to correct the problem. Since Col Mustard is a "garbage truck", I would put the time & effort into the Galaxie.

Coolant pressure test. Retorque the heads. Otherwise leave it alone until it gets worse.

I love anything f100. Whatever you wanna do I’ll watch

Looks more like valve seals. If it was rings, the outside edge of the top of the piston would be clean.

Please leave a link to the Scope. How long is the cable?

If only there was someone who could show me how to read the plugs on a Starliner? I wonder who could it be??🤔🤔🤔🤔

What about pouring small amounts of water down the carb while running to steam clean the pistons? We did that on a 302 one time and it helped.

I never heard of pre-detonation, before. I am familiar with the terms pre-ignition and detonation, which are unrelated (and often confused), aside from being terms for abnormal combustion. Detonation is the result of the fuel charge being fully consumed too early in the combustion stroke (perhaps too lean or timing too far advanced), pre-ignition is ignition of the fuel charge prior to the spark event (hot spot in cylinder, possibly too hot of spark plug). Pre-ignition will quickly destroy an engine, whereas detonation damage occurs over time.

Another thought intake gaskets slipped;, they do that quite often. They suck oil from the valley.

For what it's worth start building the other 390 and run what ya brung for now. Not sure if your doing a more performance build o. The second one ( ie poke and stroke 427) and when ya swap do a basic freshen up of the current one for the guys that find a diamond in the rough and wanna get it up and running

You know I was just wondering about this today.

Getting caught up on all my videos from last week. I’d leave it be. If you open it up, it’ll turn into “if you give a pig a pancake” if you’re not familiar with that, it’s a kids book look it up. 😂

I know it's a lot of work. I would rering it thanks 😊

if yall put a return line will it help with the fuel boiling ?

Why Kick the can down the road Rebuild

What causes a spark plug to burn the copper electrode and grounding strap off?

Blue devil block seal and run it until something else happens to it. Back to the Yellow Monster. 😜

Yes try retorquing the head

If your going to show us bad rings, then replace the bad rings😀

Full rebuild and change that heavy intake

I would put a new timing chain on it and walk away.

Just a reminder to my fellow FE fans that today is the birthday of the Cobra Jet version of the 428. Party it up tonight. Don't run over any LS engine owners. Well, try not to. A little.

Just get a rebuilt 460 and slap that in it. Go big !

Coyote swap it! The truck is in decent shape. Would make for many views and new subs. I don't think you'd be throwing good money down the toilet More likely would increase value considerably