This is self evident, but took me a while to discover. Right when you start up, everything is still cool, and you can wet your hand and feel around for a manifold leak. After it heats up, not so much.

I im new here, but I have heard that noise before. I think it is a bent rod. A few years back my grandfather had a 76 dodge pick up with a 440 and it made somthing just like that. I told him what I thought it was, so we pulled it apart, and sure enough, two bent push rods. Thats just my opinion. It may or may not be that. Just look into it if all else fails.

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'74 Duster 225 Super Six w/904
14" Cragar SS wheels

I was just about to tell you about this little trick, but terry beat me to it.
If you don't have a stethoscope, use a short broom handle or dowel rod. Place one end of it on the spot where you want to listen, press it firmly down, place the upper end against your ear, cup one hand over the rod, and cover your ear with your cupped hand, with the rod against your ear. The cupped hand magnifies the sound transmitted along the rod's length. Move the rod around to various locations to listen to every component - valve train, block above each cylinder, bell housing, etc.

Good luck with the search,
Jerry

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There's a difference between ignorance and stupidity.
Ignorance is not knowing any better.
Stupidity is knowing, yet doing it anyway.

Is this an "untouched" engine, or have you put in new pistons?
A wristpin may have come lose.

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Lasse

Signet -66 225
Holley 600 Offy-5270 Dutra Dual,regrind. cam 272 0,420 110, head shaved 0.100 slight.ported
MSD6A
A904
7 1/4 3.23

This is the right stethoscope substitute for mechanical noises (clunks, thunks, etc.). For non-mechanical noises (whistles, squeaks, suspected exhaust or vacuum leaks, etc.), use a piece of hose. One end jammed in your ear (small hose), and the other end moved around to wherever you suspect the leak might be.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

funny thing is my sl6 just started a light knocking sound at cam speed recently. I think my problem is a worn bearing since the sound gets quieter when the engine is warm and after a fresh high viscosity oil change.. Just hope its not a wear issue.

Midi wrote: (from Manifold Gasket Part 2)
so - you have decided/found that the elusive noise was only a blown manifold gasket?
thats good to hear.
it certainly sounded like one to me from your video.

regards,Rod

Could be the fuel pump — try unbolting that and running the engine to see if it still knocks.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

MiDi what's the status? I'm back from my trip so I can come over one day if need be.
PM me if needed.

It sounds exactly like mine a few months ago. It sounded great, until suddenly it started knocking.

It was the loudest just after starting or when hot, With a stethoscope I tracked the sound down to just above the oil pan rail. When I disassembled it one connecting rod bearing was completely gone and the crankshaft looked like this:

http://s537.photobucket.com/albums/ff33 ... 250035.jpg

It took a few weekends, but in the end a rebuild turned out to be a good idea. I found a few other things worth fixing. Like this:

http://s537.photobucket.com/albums/ff33 ... 210002.jpg

http://s537.photobucket.com/albums/ff33 ... 220027.jpg

http://s537.photobucket.com/albums/ff33 ... 280045.jpg

http://s537.photobucket.com/albums/ff33 ... 180026.jpg

It really does run better now, with new bearings, crankshaft, valves, piston rings....etc.

http://s537.photobucket.com/albums/ff33 ... 250001.jpg

I hope you have more luck than I had.
Roelof

check this out:

http://s113.photobucket.com/albums/n212 ... 000501.flv

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"Marilyn" 64 Dart GT & "Stella" 64 Valiant V100 Sedan - 63 Norton Project

That's kinda cool. He can stall the engine by hanging one of the intake valves open.

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Joshua

it seems rather "dry", not to much oil

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Lasse

Signet -66 225
Holley 600 Offy-5270 Dutra Dual,regrind. cam 272 0,420 110, head shaved 0.100 slight.ported
MSD6A
A904
7 1/4 3.23

Rob or MiDi will be up in a bit to tell you why.

At least the crank can keep time with the radio now.

We'll be rebuilding the engine, unfortunately MiDi's Dart isn't going anywhere soon.

CJ

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Part of Tyrde-Browne Racing

Ouch.

Killing a cylinder with intake valve held open shouldn't have engine stall out on /6.
I can keep my 2.2 4 cyl going with one cyl out.

Could be oil pump had ceased to pump?

Cheers, Wizard