Hi
Rich,
300Ds are
different. The correct engine number is 58N3xxxx. I guess the
engineers got bored that year and wanted to do something different since they
also changed the beginning VIN from the 3N55xxxx - 3N57xxxx to an
LC4xxxx.
Gloria
Moon
----- Original Message -----
Sent: Monday, January 13, 2014 3:20
PM
Subject: Re: [Chrysler300] HP block stamp
on early 300s
My experience is that 57 300's engine number was also stamped on top of
the frame, just forward of the rear wheel riser on the passenger side.
George
On Jan 13, 2014, at 12:55 PM, "Rich Barber" < c300@xxxxxxx> wrote:
Bob:
1955-58
300’s had hemi’s which were individually serial numbered in the format shown
below. The engine serial numbers had no fixed relationship with the
chassis VIN’s but were recorded by hand on the IBM build card which enables
documenting a block as “original”. XXXX’s are four-digit numbers with
the first engine each year being # 1001.
1955:
3NE55XXXX
1956:
3NE56XXXX
1957:
3NE57XXXX
1958:
I’m not sure. I’ve had both of these reported and would appreciate
being advised which is correct (maybe both?): 58N3XXXX and/or
3N58XXXX
1959 engine
serial numbers have been reported to me as MR413 XXXX or MR413 XXXXX .
No HP’s reported in ’59 or ‘60
C300K’ly,
Rich
Barber
Brentwood CA<
/span>
1955
C-300-- VIN: 3N551198, engine serial number:
3NE551098
Thanks for re-posting this
Loren, I do remember reading it before, when George originally posted it way
! back when. Of course, George is gone now, so we can't ask him how he
came by this information, but he was a very knowledgeable man and knew many
people close to Chrysler corp.
Regarding the '55 to
'59 300 letter cars, were any of those early 300 blocks stamped HP also?
I've not owned an earlier car and am not as familiar with the block
stampings. Was the '61 300G the first letter car to have the HP
stamp?
Bob J
Please excuse me if this has been sent before. I sent
this with Outlook Express and did not see it in my mail, so will send it
again. HP engines were discussed earlier in this thread. This was George
Reihl's responce to a server question about 300 engines. I have no idea
where he got this information or the accuracy of it.
Loren Nelson in sunny and finally warmer N.
Georgia
Since you asked I went
out to the garage and measured -- the HP stamp is slightly larger than the S 41 stamp -- I'd guess one
font size. The S 41 stamp
and the date code stamp are the same size.
By
the way, HP blocks are a different casting blend than standard blocks
-- higher nickel content. HP blocks also were heat
treated for stress relief. HP
blocks were built in batches, separate from normal blocks, so they were
not pulled o
ut of the production line for performance modifications. HP
blocks sat in a group in the warehouse until they
were pulled for the production line, which is why the date stamp on an
engine can be much earlier
than the car's build date.
You are correct in the
way the Chrysler blocks are cast. All 413 blocks, and others,
are cast out of the same material with high chrome and
nickel content. More than the other
car manufacturers blocks & heads contain.
Blocks and heads coming out of the foundry are
cooled then reheated for stress
relief. Then sent for the initial machining. They are checked
for sand holes, discarded if any, then final machining
and checked again. Any blocks
or heads not up to par are sent back to the foundry for
remelt.
When blocks and heads are found to be perfect, after
machining, some are destined for the "premium"
line. Generally for high performance, marine and industrial use. From what I have been told by some
of the "old timers", is that on
the premium engines, final machining is done with "new" tooling
to keep close tolerances. "Used" tooling is the used on
non premium blocks.
After all machining is done, the blocks & heads
are sent to the assembly line.
The 300 engines, Pistons, bearings, crank, etc. are
carefully assembled. All of the ! high perf. engines then get
a precise balance job. I have
been told, plus or minus 2 grams, other engines get as much as 20
gram balance.
With the high performance engines, they get a flame
hardened forged crankshaft to .060. This is what makes a H.P. engine
along with the camshaft. N.Yers. and Imps do not get these engines
and their cranks are not hardened. After the precise machining, crank,
camshaft, etc., then the "H P"! is stamped onto the block along
with the date of engine assembly.
All
413 blocks have the same casting numbers along with the various
shift codes when they were cast. Exception to that rule is
the "motor home" blocks.
They are cast special because of the extra cooling passages
cast into them and also the heads. Motor home blocks and
heads should never be mixed
with regular engine components. But their cranks are
hardened
Other non premium blocks
will have the "diamond", "maltese cross" and other stampings associated with "under sizes" incorporated
into the blocks.
Re:
undersize crank, oversize rod bearings, oversize lifter bores,
and sometimes oversized main bearing bores. On GM
engines, one can find "shims" under
the main bearing caps because of oversize line boring. Never will
one find these marks on a premium "Chrysler"
block.
All 413 blocks are not the same. Th at
goes for all the other "H.P." engines
that come out of the Chrysler foundry and machine shops, 318,
340, 360, etc.
In
all of my years, Chrysler builds the best engines.
George
Riehl>
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