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Old 10-01-2011, 07:08 PM
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scored two blocks, what do I have?

Bought two blocks from a neighbor today. They are both 3970010 blocks, one is two bolt the other is four. The 2 bolt is a 010, 020 under timing cover. The 4 bolt has 010 under timing cover but on passenger side by oil filter boss it has 010 and 020? Didn't have any calipers with me but they are both believed to be stock bore. Calipers will tell the truth. Going to build another motor for my Jeep. I gave a crank to a friend a year or two ago and it is believed to be a 400 crank but havent run the numbers so we can't remember. If it is I may go that route. What does everyone think, go with the 4 bolt main? It's going to get a Comp cams 4x4 cam probably so it wont be a high revver

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Old 10-01-2011, 07:34 PM
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You have two 350`s. The 010 and 020 don`t mean anything of great importance so no worries about that. If your not planning on making over 500 horsepower the 2 bolt block will work just fine. But if you feel the need to tighten another 6 bolts on the 4 bolt go ahead. Me, I would have both blocks checked, the one that`ll be the cheapest to machine would be the one I used.
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Old 10-01-2011, 08:18 PM
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That casting also shows up as a possible 327 block from 1968.

http://www.nastyz28.com/sbchevy/sblock.php
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Old 10-01-2011, 08:27 PM
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Don't they mean something about the metal the blocks are made from? High nickel and tin content? Well got them both for $150 with cranks so I will bring them to machine shop mon morning to start things going. Thanks for the reply
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Old 10-01-2011, 09:15 PM
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FYI: I have the same block you have (same casting numbers) and I am building it right now. I read some chatter about high nickle etc online as well. Then I read on a different forum about a fella that worked for GM in the casting department and said that was false, it's a just a myth.

Just what I read though, don't take that as absolute truth.

Mike
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Old 10-02-2011, 07:03 AM
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It's a myth just like Chevy "pink" rods were better than "stock" rods.
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Old 10-02-2011, 10:09 AM
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Now,Cool rockin daddy. here is where you are incorrect. "Pink" sbc rods were made from heavier cores. "X" or "O". Different heat treat and were checked closer for imperfections. The original rods of the series, small ends were also dipped in bearing material for floating pins.

I used to watch them in the Flint, Mi. engine plant. 1968-72.
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