Hi, Andy. I checked my GT6 parts book and didn't find
these numbers, but it is for a MkI and the engine is
definitely a Plus so I was thinking that the numbers
just didn't exist when the book was printed. Pistons
1-5 have numbers in the proper place and #6 doesn't so
I think it was definitely a replacement. The fact that
it was in the cylinder where the gasket blew makes me
think that it has blown before and the cause of the
problem wasn't corrected, probably a warped head or
a crack somewhere.
Mike Porter suggested that maybe the odd one is from a
TR6 or Spitfire or something with the right size bore
because it was available. All of the cylinders have
almost zero wear, just enough of a ridge that you can
barely catch your fingernail on it. I was hoping to do
the rebuild without buying new pistons. I am going to
mill the deck and take about .050 off the head, that
should help me spot the problem. I was looking for
the oversize to be stamped on the pistons and didn't
see it anywhere so I think 1-5 are original. Maybe
the S and R stand for standard and replacement?
Dave
-------Original Message-------
From: ZoboHerald@aol.com
Sent: 04/14/03 01:09 PM
To: Dave Fain <kc3565l@sprintmail.com>
Subject: Re: Stanpart numbers
>
> In a message dated 4/14/2003 10:15:58 AM Eastern Standard Time,
kc3565l@sprintmail.com writes:
>
> Can somebody help me identify these pistons? I removed the
> head from my recently acquired GT6 project car and found, as
> expected, that it had a blown head gasket. When I scraped
> the crud off the tops of the pistons, I found that 1-5 have
> Stanpart number 214947 S31 on them. Number 6
> has 207045 R17. That was also the cylinder that had the
> blown gasket so this is apparently not the first time this
> has happened. Can somebody tell me how far #6 has been
> overbored from that part number? The engine is an early
> GT6+ block (KD53420E). Looks like it's time for some
> serious machine work and new pistons.
First, too bad!
Second, any piston that has a Stanpart number is likely to be original
equipment (or Genuine Stanpart replacement) supplier.
Third, seems to me that almost every replacement piston I've seen has an
oversize stamped on it as well as the Stanpart or aftermarket supplier's
part number (such as the five-digit AE numbers). So there's a good chance that
all six pistons are original bore size. I don't recall if they still
stamped grade letters ("F" or "G" or "H", etc.) on the pistons in the sixes.
I can try to track these numbers down tonight at home if you don't get an
answer from someone else before.
--Andy Mace
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