Grandfather's 68 SS Camaro.

[Pro Stock John]

I'd change those plugs for sure. I personally hear a backfire though then you went to the front of the car I hear a tapping which could also be an exhaust leak from the headers.

[napa68]

There does not seem to be much oil at all on the top end (by what I can see)

And yes, #8 exhaust has minimal movement.

[JRC99]

Originally Posted by napa68

There does not seem to be much oil at all on the top end (by what I can see)

And yes, #8 exhaust has minimal movement.

It had only been running for a few seconds in that video. It gets oil okay thankfully, and if the gauge is any good (and I probably should put another one on it to verify) it cranks at 60psi.

So there is absolutely an issue with the #8 cylinder, it's just a question of lifter, cam lobe, both, valve, valve spring.... etc.

[napa68]

If the exhaust valve is not working (for whatever reason) that would contribute to the carbon fouled plugs. It would be easy to back off the #8 rocker arm (when the intake valve is staring to close) in order to see if the push rod is straight.

If it's bent, well that would be an easy fix. But, usually there is an underlying reason the push rod is bent. In my case (early years) it was due to missing 3rd gear

You could say I broke some parts while honing my craft

[Too Many Projects]

The exhaust valve not opening enough will cause a backfire thru the carb, as the cylinder IS getting gas and firing, but the burnt gas can't get out of the cylinder, so it will back up into the intake when that valve opens.