Thread: 4 year old rebuild in Corvette - now tapping or knocking...leaking oil

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Originally Posted by lrsmith62

NTFDAY....as a matter of fact, yes, I'm running original draft tube and filler neck in the Edelbrock intake. Interesting question....why?

The engine has to have a way to breathe and I've seen those who will delete the road draft tube and put a closed breather on the oil filler tube. They won't run a pcv system because they don't want to hack up the finned Corvette valve covers. That will cause a massive pressure in the crankcase pushing oil out wherever a place can be found.
I experienced that on a cherry 57 Ford in 1964 in California. After a 1000 miles or so the dipstick blew out, dented the hood, covered the right side of the windshield in oil and wiped out the bearings.

Can you see through the pushrods out of #8, or can you run a piece of safety wire through them unrestricted? I'd still drain the oil and check for metal. If you wiped a lobe that's a bunch of microscopic abrasive flowing through the engine, so you're looking at a total teardown. I wouldn't waste a nickel on building a flat tappet cam engine today. It's been said that it's not "IF" it will fail, but only "When" it will fail.

If you didn't wipe a lobe? It's a pretty healthy knock from the video, so chances are you're gonna be taking it down, at least enough to get #8 pulled out....

Here is video after valve adjustment....top end noise lessened but still tapping for sure. Also, engine not running as smooth as it used to....a little sluggish on idle every 30 sec. or so.

https://youtu.be/sb02Ul1NNLs

Push rod not clogged....so I guess I'll drain and look for metal, probably also pull intake and check tappet, pull pan and check #8 bearing as well to make sure it's not spinning. Need to re-seal everything anyway. Bah humbug....this is why we like old cars, right