Well I'm putting my lt's on soon and tuning it up while I do it, It doesn't sound like it but it is possible hopefully putting them on might help....

 

The same thing happen to me. What i found was a cracked manifold on the passenger side.

 

Well unless i can figuer it out I'm gonna drive it till it grenades, gives me an excuse to build thge stroker motor I want, I'm looking to buy a block now so I can at least get started

 

I have heard bad head gaskets knock like a rod...when they blow between the cylinders...of course it never goes away...but a bad HG can cause a knock...

 

Same thing happened last weekend. I hear mine mainly at idle becuase my exhaust it loud but at the front of the engine you can hear a definate ticking. I adjusted the rockers and it went away a little. I still think i collapsed a lifter.

 

I used the matco combustion leak tester to see if I had a blown head gasket and it tested out fine, how can I tell if it's a collapsed lifter?

 

My Impala did the same thing yesterday. After running it to town and back i shut it off and about an hour later I started it and there was an awful ticking noise. pulled the valve covers today and found a rocker arm(comp pro mag 1.6 S/A) loose on cylinder#4 exhaust. The funny thing was the nut was tight and so was the polly lock. This is with CC R lifters. I have heard terrible things about the R lifters lately here and on the Impala forum. Well I reset the lash (car running) and seems to be fine now so far, but if it comes back the lifter has failed and will replace all with something other ran the Comp R's. Good luck.
HVY SS

 

Spun bearing and lifter or valvetrain noise sound alot alike.