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Old 08-27-2002, 10:21 PM
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Post S/B chevy nickel content??

Alright,aparently I as miss informed on reading the #s under the timing cover.The article I allways used for referance said 509,512,532 stood for high nickel blocks.The same article also said that The #010 in between the freeze plugs on the side of the bock meant it was not a good block.
Now I here that 010 means 10% nickel content and 020 means 20% nickel.But what about the 010 in between the freeze plugs?????
The reason I ask this is I informed another rodder on another site that 010 was not a good block.I was then corrected and Insulted which resulted in me calling someone a F head which resulted in me getting in trouble. The other reason I ask this is my new block has #X with 207 under it and G41 under the cover and I'm not sure what to think.Also I found #509 in the back in the flywheel area.The block # is 14010207 its an 80-85.I thought it was high nickel now I'm not sure.
Anyone got a clue as to if my article was correct???? Also anyone know what my block is???

[ August 28, 2002: Message edited by: 78 monte ]</p>

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Old 08-28-2002, 01:32 PM
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Monte...On Mortec.com that number shows that block to be a 350 between 80 and 85 (You probably already knew that). I was always told that if there was a 20 under the timing cover or the flywheel it meant 20% nickel. If there is a 10 and a 20 that also meant 20% nickel. And I was also led to believe that just a 10 was not a good block. My responce probably didnt help you much but at least it moved this thread back to the top of the board.......I have three 350's with the number 20 stamped on them, one is a 4 bolt, so I would like to know the answer to this one myself.

Hey 4 Jaw...speak up ! !

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Old 08-28-2002, 03:00 PM
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20% nickel in any steel is more nickel than that used in surgical instruments. A typical content for stainless steel is 18% as in 18-8-1 SS. More likely the content is closer to 0.2%. I doubt they would add any more than that to cast iron for alloying. I guess this discussion is more about a certain magazine article that has made some statements about what casting numbers mean. My advice to you is if it doesn't come from the manufacturer as a fact then don't believe a word of what you read. Casting numbers can mean almost anything and trying to ascertain what they mean and what material was poured into the molds needs a factory explanation. Rodding magazines are full of so much BS it isn't even funny. Why not ask the horse instead of talking to the behind, <a href="http://service.gm.com/forumdisclaimer.html" target="_blank">CLICK HERE!</a>.
“She may not look like much, but she's got it where it counts, kid. I've made a lot of special modifications myself.”

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