Re: {Chrysler 300} 413 pistons.
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Re: {Chrysler 300} 413 pistons.



All,

This is a neat discussion for me to read as I am contemplating rebuilding my Bs engine here in the next year or so. 

John if I am understanding what you are saying, if there is no discernible ridge or damage to the bore the best thing to do is put good rings on the piston and leave the bore alone.

That was something I was thinking about as you hear all of the horror stories of blocks being ruined by poor shop work. Also availability of new pistons and rods.  

Thanks
Zach Hietsch

On Jan 11, 2024, at 11:26 AM, Henry Schleimer <henry.schleimer@xxxxxxxxxxxxxxx> wrote:



My first car was a well used 71 Valiant with 318.  Used to blow smoke if you gave it more than ¾ throttle.  Being a broke student, I drove it like that for 4 years until I could afford to rebuild the engine (and restore the rest of the car).  Took 40 thou over to clean up the bores.  Rings were still ok.  My “theory” was the factory chrome face rings were too hard at the expense of the bores.  Bought a 74 Chrysler 360 for wrecking and the bores were worn out the same.  Took that block to the dump – wouldn’t do that now – but put the heads on the 318.  Anyway, I used moly rings on forged pistons instead.  At the time there was a shop importing forged pistons for about the same price as local (Australian) cast ones and they never made any noticeable noise.  Drove it for 50,000 km before selling it and never used any oil so I assume all was well.  No need to be afraid of reboring an engine if it is worn out.  Bad taper will kill  top end power plus annoy everyone behind you.

 

The 300C I bought had a “rebuilt” engine 40 thou over which did run.  However I pulled it apart (don’t trust strangers) and found the pistons (while new) had vertical scratches all over them.  Rebuilder forgot to put the spacer ring on the end of the cam and the back face of the cam sprocket ground itself into fine particles which filled the engine.  Decided new  pistons and rings (and oil pump etc, etc) were needed to fix that mistake but luckily only a light hone on the bores was required.

 

My take on both examples is find a good machine shop but put the engine together yourself....

 

Henry

 

 

 

From: chrysler-300-club-international@xxxxxxxxxxxxxxxx [mailto:chrysler-300-club-international@xxxxxxxxxxxxxxxx] On Behalf Of John Grady
Sent: Thursday, 11 January 2024 11:36 PM
To: Jean-Yves Chouinard
Cc: chrysler 300 club
Subject: Re: {Chrysler 300} 413 pistons.

 

Hi , 

i may have a set from long ago . not sure of size ( overbore) will look 

why do you need new ? are you overboring  it ?

As you know , my feeling is unless something is really really wrong ,

put rings on

old and go . Have done that 5-6 times in life no problems . “ expert  “ will always say rebore, way it is . 

(Sell up , best dentures)

so three jeep 4.0 done that way two i personally drove both to 300 k , zero

oil use , 318 also went 300k in 57 plymouth ..all old parts no machine work . 

key is really good moly rings 

be sure you know forged or cast pistons when comparing , both work but forged a lot stronger . 

changing pistons gets into balancing . Any screw up boring  wrecks rare 300G block  I had a 327 chev ruined by “ pro machine shop “ just trying to remove ridge , a chip “fell down “ caught into guide roller deep scratch in wall . had that happen on small  kohler engine too .

i did not remove ridge on jeeps could not feel any with finger tip , yes took a chance . It depends  — your mileage may vary but if a teal ridge should be removed 

02 jeep year had junk cast mopar pistons , skirts broke off , other one (98) had antifreeze leak into oil used those over again . third one had been run out of oil (ex wife)!

i bought the jeep pistons from silv -o- lite , a branch of keith black racing engines . 120$ for  6. 150 k miles ago ,,had machine shop do exchange  on rod  , press fit into rod like mopar . used as they came compared weights  to old seemed ok

 

there are specs in fsm on taper etc measure block for yourself . ridge too

Even if pushing upper limit on wear it will work fine . Most of the time hardly worn at all !! 

 

my 02 , I know . My cynicism results from 260 ford rebuilt  for my dad with all new ovetbore etc burned so much oil had to be rebuilt agaiin 30000 later . 

Shop kept saying it will wear in . I was left with thin wallet mad dad , and junk motor made of all new parts

 

As far as real wear many in club have gone 300k on hemi , Jerry Kocur went 300 k and 400k

on his B block . A 100 k

mile B block

is barely broken in ,  . I know , opinion , but backed by 5-6 examples .  

on other hand if damage have to do it 

Sent from my iPhone



On Jan 10, 2024, at 8:28 PM, Jean-Yves Chouinard <jymopar@xxxxxxxxxxx> wrote:



Hi everybody.

Anybody ever bought pistons from Old Parts Source?

If so, product o.k?

I need pistons/rings to rebuilt my 300G 413...

Feedback appreciated.

Thanks!

Jean-Yves Chouinard

 

These are 3 ring pistons that are anti-friction coated, diamond turned, and weight balanced! NOTE These are available in several sizes: STD, and. 030. 040, and. 060 oversizes. Old Parts Source is excited to announce that many of its popular pistons are now supplied with a high-performance, antifriction coating.

www.ebay.com

 

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