Re: [Chrysler300] Bent / Stuck Valve

[whuff <whuff@xxxxxxxxxx>]

Hi Richard,

IMHO the small gouge in the piston is nothing to worry about, I don't think 
the valve is strong enough to  hurt the piston with only a small ding like 
that, de-burring it is the right thing to do.

Just off the top of my head, it sounds as though when the engine got hot, 
that valve seized in the guide.  It may be worthwhile to have that guide, 
and the others as well, verified that they were reamed for proper 
clearance.  I don't know how hot the engine actually was, but I have had a 
couple of RB engines VERY hot over the years and never noticed any adverse 
aftereffects.  They weren't just overhauled, that may had meant more 
clearances for expansion.  Wasn't that the head that lost the freeze plug, 
might have gotten extra hot, you might want to have the head surface 
verified as well.

Have you tried a Mopar specialist for the freeze plugs?  I get mine from 
Mancini Racing to Florida in about 3 days, brass or steel.  I have never 
had a problem.  The oldest B/RB block I have worked on is a '67, but I 
don't think the holes changed diameter.  I guess I will find out when I do 
my old 350.

Good Luck,

Bill Huff

At 8/22/04 10:22 AM, Richard Osborne wrote:
>Good Morning,
>
>I got the right side cylinder head off of the G. Sure enough, the
>exhaust valve on #6 is stuck open. I can't find a spring compressor, but
>some initial measurements  show the valve to be bent. Much to my
>surprise, the valve seat seems to be still in place and unaffected.
>Also, it has bounced off of the piston leaving an elliptical indentation
>approximately 1/2 inch long and maybe .010" deep (hard to measure with
>my dial gauge setup).
>
>Question: What are your thoughts about the piston? Can it continue to
>be used? I plan on filing the "burr" off of it so as not to create a hot
>spot. It doesn't look that bad, but I have never had to deal with this
>situation before.
>
>My travel schedule is rather full for the next few weeks, so I would
>like to get the head back to the machine shop tomorrow.
>
>Thanks again for all of your help.
>
>Best regards,
>
>Richard Osborne
>
>
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