Quick video, help me identify this sound

[Mrturner1]

Originally Posted by Grumpy old man

Are you still trying to run race fuel thru that engine ? Add a can of STP oil treatment to it use castrol 20-50 oil and another new filter ,lock your tools up and drive it for 100 miles keeping your foot off the gas pedal, use regular unleaded fuel and drive it like your new baby is sitting on the seat .

Nope, I actually never ran race fuel. I added about a half gallon to a full tank of pump gas because it needed it. I don't understand the locking up my tools thing, although I've heard that twice now, weird. This isn't something that happened due to me tinkering and I'm actually getting to be pretty handy with my tools.

As for the oil, it's fresh and so is the filter. It's not 20w50 but it's good oil with ZDDP additive. I'd be driving it if I knew for sure what this noise was. Don't wanna get stuck somewhere if she breaks down.

[Mrturner1]

Originally Posted by davepl

Do you know what your base timing is at now, with vacuum advance line plugged at the carb? To get hot tubes at idle normally takes wicked retarded timing and some load.

Did I just say "Wicked Retarded"? Yes, but it was about a distributor.

Right now it's set at 12*btdc, which I think is mildly retarded, certainly not wiked retarded though lol I was thinking timing as well, but it's only the two rear tubes on the passenger side. I figured it's gotta be valves aren't fully shutting because lash is too tight (fuel burning in the header pipe turns it red) so I backed those two exhaust valves off 1/4 turn. Seemed to take care of that. This noise is still there though, and I'm starting to wonder if it's a lifter squeaking. I don't know if they do that, but it seems like they would because the pump up and down and rotate. It's not consistent though, and maybe a lifter noise would be? I'm taking a good look at the flywheel today, somebody mentioned cracked flywheel

[snipescastle2]

valves that are too tight will sound like "Whistling" as the air/fuel/exhaust blows past them, if left that way, will burn your valves/seats. better check that lash again.....
Ben