Thanks to all for the responses. Now I understand why the 300F doesn't have HP stamped on the engine.  It's simply because the practice started with the '61 model year, even though the F & G were the same engine! That's why I love this list, always something new to learn.
Bob J
From: George McKovich [ mailto:george@xxxxxxxxxxxx]
Sent: Monday, January 13, 2014 12:21 PM
To: Rich Barber
Cc: Bob Jasinski; <Chrysler300@xxxxxxxxxxxxxxx>
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 300â??s had hemiâ??s which were individually serial numbered in the format shown below. The engine serial numbers had no fixed relationship with the chassis VINâ??s but were recorded by hand on the IBM build card which enables documenting a block as â??originalâ??. XXXXâ??s are four-digit numbers with the first engine each year being # 1001.
- 1955: 3NE55XXXX
- 1956: 3NE56XXXX
- 1957: 3NE57XXXX
- 1958: Iâ??m not sure. Iâ??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 HPâ??s reported in â??59 or â??60
- C300Kâ??ly,
- Rich Barber
- Brentwood CA< /span>
- 1955 C-300-- VIN: 3N551198, engine serial number: 3NE551098
- From: Chrysler300@xxxxxxxxxxxxxxx [ mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of Bob Jasinski
- Sent: Monday, January 13, 2014 11:05 AM
- To: Chrysler300@xxxxxxxxxxxxxxx
- Subject: [Chrysler300] HP block stamp on early 300s
- 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
- From: Chrysler300@xxxxxxxxxxxxxxx [ mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of Loren Nelson
- Sent: Monday, January 13, 2014 9:23 AM
- To: Chrysler300@xxxxxxxxxxxxxxx
- Subject: [Chrysler300] Re: That's Racin' - Warren ave plant
- 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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