Did someone drop a hammer into my engine? BANG BANG BANG!!

[Anonymous]

'68 I6 w/'69 head, stock non-adjustable rockers

My engine wasn't just rebuilt but she started making a horrible banging noise last night. I went out to check the timing (THIS IS BEFORE THE BANGING STARTED) and when I turned it over, CLANGity CLANG!. I shut it off quick waited a few seconds and gave it another turn...same thing. I went from checking the timing to this in <2 hours:

I'm planning to drop the pan tonight and see what I find.

Now in reading what rbohm wrote, DAMN IT!. Would low tranny fluid cause this really loud banging noise?!? I'm pretty sure my tranny fluid is down a bit...maybe even quite a bit (I was planning to add fluid last night before this happened!).

Oh yeah, the other wierd thing that be a clue for someone smarter than me. I did try a third time to turn it over. It didn't make the clanging as badly this time but the RPMs were doing a steady WAVE! climb up, then drop down, back up, back down. Does that indicate anything in particular I should look for?

Thanks all!

 

[CobraSix]

Is it more a bang, or a rattle?

When I but my engine in last year, my oil pan was bent and the counterweight from the #6 piston was hitting the pan.

now, I have a rather annoying rattle that is caused by my port divider breaking loose.

Slade

 

[Anonymous]

a very strong CLANK, not a rattle/ticking!