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Old Dec 16, 2005 | 08:14 AM
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I'm looking for a replacement 350 Core and so I called a local junkyard that says that he has one ($100). He is not sure if it is a 350 or a 305. I asked him to tell me the ID#s on the block but he said that I would have to come out and look at that - Fine I will then.
I want to be sure that I am looking at the correct block and that I don't buy a POS. I am looking for a block that has not been overbored yet and that I can make a .020 overbore out of since the pistons I have are this size.
Is there a way that I can easily tell if it has been bored out and if so how much?
How to tell a 305 from a 350? Block ID numbers?
What other things should I be looking out for on a junkyard block?
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Old Dec 16, 2005 | 08:23 AM
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Originally Posted by 79vetter
I'm looking for a replacement 350 Core and so I called a local junkyard that says that he has one ($100). He is not sure if it is a 350 or a 305. I asked him to tell me the ID#s on the block but he said that I would have to come out and look at that - Fine I will then.
I want to be sure that I am looking at the correct block and that I don't buy a POS. I am looking for a block that has not been overbored yet and that I can make a .020 overbore out of since the pistons I have are this size.
Is there a way that I can easily tell if it has been bored out and if so how much?
How to tell a 305 from a 350? Block ID numbers?
What other things should I be looking out for on a junkyard block?
Try this site, it should give you the info you are looking for.

http://www.mortec.com/bbc.htm
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Old Dec 16, 2005 | 08:47 AM
  #3  
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Hey 79vetter I am over here in the GrandPrairie/Arlington area.If you need any help getting that engine in or out I am off Friday's and Saturdays send me a pm and I can come over and give you a hand if needed. I dont know much about Corvettes and you forum people have been super help. I did just rebuild and install the engine in my 77 so I do know how to install the engine. Rick
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Old Dec 16, 2005 | 08:52 AM
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Originally Posted by 79vetter
I'm looking for a replacement 350 Core and so I called a local junkyard that says that he has one ($100). He is not sure if it is a 350 or a 305. I asked him to tell me the ID#s on the block but he said that I would have to come out and look at that - Fine I will then.
I want to be sure that I am looking at the correct block and that I don't buy a POS. I am looking for a block that has not been overbored yet and that I can make a .020 overbore out of since the pistons I have are this size.
Is there a way that I can easily tell if it has been bored out and if so how much?
How to tell a 305 from a 350? Block ID numbers?
What other things should I be looking out for on a junkyard block?
I don't think I would want to deal with a junkyard thats too lazy to leave the desk and walk out to the yard to look at a few numbers on the block. That tells me that they either don't care about making a sale or trying to hide something. For me it's mainly because thier return policies are horrible if somethings not right.

Good Luck with your search
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Old Dec 16, 2005 | 10:40 AM
  #5  
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Have you priced new bare blocks for comparison? By the time you get all of the machine work done on an old block you might exceed the cost of a new block. You will have to spend a certain amount of money just to have the block checked and magnafluxed before you will know if it is even a rebuild candidate. I wouldn't count on getting that money back from the junkyard if the block is cracked or otherwise unusable. The best they would do is give you another one.

Good luck.

Rick B.
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Old Dec 16, 2005 | 12:01 PM
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From: Dayton Oh
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Originally Posted by 79vetter
I'm looking for a replacement 350 Core...
Is there a way that I can easily tell if it has been bored out and if so how much? What other things should I be looking out for on a junkyard block?
To check to see if the block has been bored, you'll have to take the heads off and measure the bore diameter with a micrometer. An unbored 350 should measure approx. 4.000" in diameter. 20-over would be 4.020", 30-over would be 4.030", etc. Of course, the exact diameter may be a little over due to use. So instead of getting a perfect 4.000", you might see something like 4.005".
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