I have a 360 Magnum swapped into my 1980 volare, and the motor had about 150,000 miles before I tore it down and put in new gaskets and the like. I didnt rebuild it because it was in excellent condition, still had cross hatching without any noticable wear on the cylinder walls. I started it last night and immediately it started makinging this sound-
https://youtu.be/fmBkdXCGZ-w
I know it already has a gasket leak at the header, but I didn't think it'd get this bad. I pulled the plug wires off one at a time and the noise didnt change and it seemed to go away with increasing rpm. I'm really crossing my fingers that it's nothing in the bottom end, but I'm wanting to get some others opinions on what it might be, any suggestions would be appreciated. I can get a better video today if I need too

 

c -

It doesn't change when revving, so odds are it ain't in the engine. Sounds more like something is loose, rattling or possible making contact with something. Go over ALL the bolts and report back.

Archer

 

If I remember correctly, the Magnum flexplate was really close to the oil pan I used, so I'll definitely check everything including the converter bolts when I get out of class today.

 

c -

If you have the protective cover for the torque converter on, remove it and see if the sound changes.

Archer

 

https://goo.gl/photos/wya3d8mY62RtY31P9
https://goo.gl/photos/mKRHn1gpbLGoXCbQ6
Well, I went ahead and check everything I could think of and it was all tight, so I changed the oil and opened up the filter and this is what I found...

 

Charlie -

OK, that looks pretty bad, but doesn't account for the sounds in your video, since they didn't change with engine rpm.

??????

Archer

 

Main bearings?

 

I finally got around to pulling the motor and tearing it down. I was beginning g to feel discouraged when all the rod bearings were looking okay, but then I took off the main caps...

http://goo.gl/photos/G7YQggt1xo8fUm7F9
https://goo.gl/photos/G7YQggt1xo8fUm7F9

How can the mains cause a sound like they did?

 

Make sure that you put a new oil pump on your parts list, I would because that one looks like it was run dry.

 

Loss of oil pressure = loss of oil wedge = metal to metal = knock, knock who's there?

 

No who's on first., whats on second and I don't know is on third!