Aside from Bill's theory, it might be an ignition crossfire. Check the
routing of the plug wires. It's different from your description, but
ignition arcing usually sounds like a sharp snapping sound. If a
cylinder was misfiring with one where the intake valve was open, you
could get carb backfires. The problem would be accompanied by the engine
running rough under load.
However, loud clattering sounds like bearings... it is possible to pull
the oil pan and remove the main bearing caps (at least #2, 3, and 4) and
check out the bearing shells. It's a pain to do but if you did catch
that problem before you're left with a seized engine you'll save
yourself a lot of cost in replacement parts and machining.
Theo
William Lau wrote:
> I can't imagine how this could relate to what happened to you but a noise
> under load or acceleration is usually a main bearing. I would call it a
> thud but it depends on how an individual describes it. Obviously you still
> have oil pressure or you would notice, but you can have pressure and still
> have a knocking main. I sure hope I am not correct and it is something else.
> Good luck. -- Bill --
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