Chevy engine casting numbers

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[[File:Chev block codes.jpg|right]]
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<br><br><br><br><br>
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==Chevy engine casting numbers==
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Chevy block casting numbers can usually be found on the rear of the block adjacent to where the block and transmission meet. Look on the top on either side of center.
  
A basic list of webpages with Chevrolet engine casting numbers.
+
*[http://www.mortec.com/location.htm Chevy V-8 Casting Number Locations] by Mortec
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*[http://outintheshop.com/faq/casting/castings2.html Chevy BB and SB casting number "go-to" site] from outintheshop.com
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*[http://www.nastyz28.com/sbchevy/sblock.html Smallblock info] from nastyz28.com
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*[http://www.73-87.com/chevy_ids/sbcid2.htm SBC ID] from www.73-87.com
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===Inline Chevy===
 +
*[http://www.inliners.org/becks/BCN2.html Inline engine casting numbers] from inliners.org
  
*[http://www.mortec.com/castnum.htm Mortec.com casting numbers]
+
==Chevy head casting numbers==
*[http://www.nastyz28.com/sbchevy/sblock.html Nastyz28.com smallblock info]
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*[http://outintheshop.com/faq/casting/castings2.html Chevy BB and SB casting number "go-to" site] from outintheshop.com
*[http://www.73-87.com/chevy_ids/sbcid2.htm www.73-87.com]
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*[http://chevytech.info/3c10o12.html Head info by c/n, some with photos] from chevytech
*[http://www.classictruckshop.com/castgm_smblock.asp ClassicTruckShop.com]
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*[[SBC cylinder head identification]] Crankshaft Coalition wiki article
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 +
==Suffix code==
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[[File:EngineCodepartialVIN.jpg|right]]
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The suffix code is located on a machined boss located on the front passenger side of the block where the head and block meet.
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 +
{{Note1}}Many data bases do not include all the truck suffix codes, so it's not at all uncommon for one to not show up. Just be sure the suffix is actually what you think it is, they can be hard to read sometimes.
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 +
If the block has been resurfaced (decked), the codes might have been removed and in that case the date and casting numbers will need to be used to ID the parts, along with any other visual cues that may be available.
 +
*[http://chevymania.com/partsid/suffix.cfm?block=Small SBC suffix codes] from chevymania.com
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*[http://www.chevymania.com/partsid/suffix.cfm?block=Big BBC suffix codes] from chevymania.com
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*[http://www.nastyz28.com/chevy-engine-code-stampings.php Suffix and VIN codes] from nastyz28.com
 +
 
 +
===Partial VIN===
 +
There may be a partial VIN number in one string of letters and numbers and the suffix code will be at the end of a second string of letters and numbers.
 +
 
 +
==Date code==
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The date code is located in the same area as the casting number on the Chevy V8 engines.
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The date code generally has a letter followed by two or three numbers. The letter is the month. The next number or two numbers will be the day of the month. The last number is the last digit of the year.
 +
:Example: '''C124'''
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:*C = March (A = Jan., B = Feb., etc.)
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:*12 = day of the month
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:*4 = year ending in 4, i.e. 1964, 1974, 1984, etc.
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 +
==3970010 casting number==
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The large journal 327 was only used briefly, so the vast majority of c/n "010" blocks we assembled as 350ci from the factory. Due to the built-in interchangeability of the SBC engine along with the vast aftermarket support it enjoys, there may be a different stroke crank in any given engine, especially among the 4" bore, 2.45" main journal diameter blocks like the c/n 010- the factory used 3", 3.25" and 3.48" stroke cranks and the aftermarket has supplied many others, including the popular 3.75" "SBC 383 stroker" crank.
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As far as for buying parts, etc., the important things to know about the c/n 010 is the block has a 4" nominal bore diameter, it has a 2-piece rear main seal, a 2.45" main journal diameter, and the dip stick is on the driver side of the block. The 010 block was never used w/a factory roller cam. It may be a 2- or 4-bolt bottom end, 4-bolts are commonly found in trucks/vans/buses as well as some high performance passenger car applications.
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 +
==="010/020" blocks===
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Much speculation has surrounded the metallurgy of the cast iron used in the SBC blocks, and none more so than the c/n 010 block. It will often have 010 and 020 (or various combinations) cast (not stamped) into the block in locations like under the timing cover.
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 +
The rumor is that 010/020 denotes addition of tin and nickle (or nickle and tin) to the cast iron. Variously, the amounts have been reported as 10% and 20%, 1% and 2%, .1% and .2%, et cetera.
 +
 
 +
Whether this has any foundation in truth is debatable. Suffice to say, ANY c/n 010 block is good for no more output than any other similar bore and main journal diameter 2- or 4-bolt having similar inspection/preparation/machining done to them. There's nothing magical about a 010/020 block, and no extra effort should be expended or money spent to find one, according to many engine builders.
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 +
One thing that should be considered, however, is the newer Vortec era blocks (1996-up) have a slightly shorter bore at the bottom, nearest the cam tunnel, as shown below left (on the right is a c/n 010 block). This isn't a problem in most cases, but if a stroker crank is being considered, this should be looked into to be sure there'll be no issues due to the lack of piston support at BDC.
 +
 
 +
[[File:SBC BORE DEPTH 002.jpg|left]][[File:010 block.jpg|right]] <br style="clear:both"/>
 +
 
 +
==BBC casting number data bases==
 +
*[http://www.mortec.com/bbc.htm Big Block Chevy V-8 Casting Numbers] by Mortec
 +
*[http://www.nastyz28.com/bbcmenu.php Big Block Chevy Engine Parts Identification] from nastyz28.com
 +
 
 +
==Resources==
 +
*[[Identifying Chevy engines]]
 +
*[http://www.nastyz28.com/sbchevy/sblock.php SBC general decoding information]
 +
*[http://webpages.charter.net/beckracing/silvtoc.htm Stock piston specs]
  
 
[[Category:Engine]]
 
[[Category:Engine]]
 
[[Category:Identification and decoding]]
 
[[Category:Identification and decoding]]
 +
[[Category:GM]]

Latest revision as of 01:19, 4 March 2014

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