Arondwreck12

Alright

I have a 427 and missed 3rd and over revved it and a few weeks later it started knocking. Had to replace the valve train and lifters on the passenger side. Once I had everything replaced it is still making a knocking sound that sounds like it's coming maybe from the cam? I'm not a mechanic and I've had a lot of different story's on what is wrong. Just looking for some other opinions.

KevinR

If you over revved it, there's a possibility that it's a bent pushrod. You said that you replaced the valve train on the passenger side, is the "knock" coming from the driver's side now?

Arondwreck12

No it's coming from the center of the engine and none of the push rods look bent. I've laid them side by side and rolled them all no wobble or anything.

KevinR

Not trying to be an *** here, but why did you only change the passenger side lifters? Also, what is your set up?

Arondwreck12

Just financial reasons. And I didn't see any problems with the other lifters. You thinking its a lifter problem? And it's just a regular 427 set up with a fast 92 intake no other mods to the motor.

Arondwreck12

Just financial reasons. And I didn't see any problems with the other lifters. You thinking its a lifter problem? And it's just a regular 427 set up with a fast 92 intake no other mods to the motor.

KevinR

It's hard to say. Can you post a video of it?

CySevans

If you over-revved it, you might have spun a bearing and have a rod knocking. If you continue to run it without inspecting the bottom end, you can kiss that engine goodbye,

Chevy406

iTrader: (12)

Drain the oil into a clean container and inspect for any signs of copper bearing material.
Perform a leak-down test on all cylinders which will tell you if you have a bent valve

By the way, where are you located?

silverWS.6

iTrader: (1)

Crazy idea, but exhaust leaks can sound like "knocking" sometimes