You should hope so.  Otherwise it's likely piston slap (a piston loose
in it's bore or a bad wrist pin) or something else expensive.
As I recall you've got a 1500, which, if it >is< a rod bearing, is a
"good news - bad news" story.
Bad news:  The 1500 is notorious for beating the heck out of it's bottom
end.
Good news:  It's likely that it is a rod bearing.
Bad news:  You should probably replace the entire set of main and rod
bearings.
Good news:  You can replace the main and rod bearings with the engine in
the car.
Bad news:  I didn't say it was easy.
Good news:  It isn't real expensive.
I'm probably doing this job this weekend, so I'll have fresh
recollections to convey early next week.
Chris K.
Adrian Barnes wrote:
> 
> A quiet knocking sound when the engine is cool that turns into a loud
> knocking sound when the engine is hot (thinner oil) is probably a rod,
> or otherwise not cheap, right?
> 
> J. Adrian Barnes, MCSD, MCT
> Senior Software Engineer/Department Manager
> Business Information Group, LLC
> 
> http://www.midgetweb.com
 
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