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  #16 (permalink)  
Old 07-20-2006, 04:50 PM
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OK, here is what I am talking about. This pic shows the 010 and 020 cast into the block under the timing chain cover. According to Mortec the 010 means 1% tin and the 020 means 2% nickel.
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  #17 (permalink)  
Old 07-20-2006, 06:35 PM
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alright i got you now. we were saying the same thing...kinda. except you made a boo boo when you said "020 blocks have 2% more nickel"

a "020 block" means a block with the casting number 3970020 which means it's a 307 block.

the number 020 thats casted on a 397010 block means 2% more nickel, so yes you are correct there. thats what i was saying

you might wanna watch how word it next time or your gonna get very confused and frustrated

good luck with the build,

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Old 02-17-2007, 11:39 PM
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i beleive what the other people are talking about 0010 blocks are casting number 3970010 were used for around 20 years and are plentiful. what you want to look for are the casting mark of 010 020 behind the timing cover and also on the rear of the block. these are "high nickle" blocks and are much stronger than a typical 350 block. most all truck blocks in the 70s are these and the truck blocks were all 4 bolt mains back then, some may complain about the 2 pc rear mains because they couldnt insatll them correctly and they leaked. the 010 020 is the extra percentage of nickle and tin added to the cast to improve strength. i beleive it is 1% tin and 2% nickle. but then again a properly built 350 of the weakest cast even a 2 bolt main can throw down some serious horse power without any trouble. if you are looking for a strong block to make up for a shady build you better get the high nickle block with a 4 bolt main.
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Old 02-18-2007, 10:43 AM
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The 010/020 are better do to the high nckel content but try to find a 010/020 with 2482 on the center caps as those are the nodular iron 4 bolt caps GM used on heavy duty and performance appliction engines.

Have the block sonic tested for cylinder wall thickness as we soinc test every block that goes through are shop and it amazing how many are not to good as you really can't go by core shift from what I have seen.
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Old 02-18-2007, 11:36 AM
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I have a 1970 LT1 motor. The casting number is 3970010 and the numbers under tyhe timing cover are 020 020. I think that this is 2% nickle and 2% tin. The nickle gives better cylinder wear and the tin gives more uniform heating and cooling.
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Old 03-07-2007, 01:00 PM
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re:re: Which sbc 350 block castings are the best to build up?

Have anyone heard anything good, bad, or indifferent about the 14093638 blocks? It's a 4 bolt, one piece rear seal.
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Old 03-07-2007, 02:49 PM
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If I'm going to build a stout, high-horsepower engine, I would look for a 1974 or earlier block, preferably a 2 bolt version. These older blocks are noticeably heavier and are not of the "thin wall casting" variety. I prefer the 2 bolt main if the customer is willing to pay for the installation of splayed main caps. If you can find a high tin and nickel block, all the better.

I personally don't care for the later, 1-piece rear main blocks. To me they seem to be pretty "springy" and light-duty. It's probably just me. The '96 and later Vor-Tec 350 block is a known "springy" block and there are bulletins to that effect.

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