Editing Chevy engine casting numbers (section)
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==="010/020" blocks=== 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. 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. 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"/>
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