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a 390 bored.30 over= a 428 cobra jet these days..

January 25 2002 at 7:54 PM
Mike  (no login)


 
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Bob
(Login 68-shelby)
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Not the first time....

January 25 2002, 8:17 PM 

this has been on ebay. I suppose some one will buy it eventually. A fool and his money....

 
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onesmrtguy
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Can you bore a 390 block 0.30" over?

January 25 2002, 8:35 PM 

What is the max you can go?

 
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Bob
(Login 68-shelby)
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Mine is .060 over and running fine.

January 25 2002, 8:36 PM 

n/m

 
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onesmrtguy
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What then is you cu.in. displacement?

January 26 2002, 2:06 AM 

What compression ratio, etc.? How much HP are you getting? Any info is appreciated. Thank you

 
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S.Vincent
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Displacement

January 26 2002, 3:29 AM 

I think a .060 390 is about 400 cubes.

 
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Barry Gaugler
(Login spookytruck)
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.060 over brings a 390 out to roughly 402 cubic inches.

January 26 2002, 8:12 AM 

n/m

 
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S.Vincent
(Login S.Vincent)
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Hey Barry! How about we split the difference?

January 27 2002, 12:02 PM 

The formula for cubic inches is Bore x bore x .785 x stroke x 8(no. of cyl.s) so a .060 over 390 would come out to be 398 cubic inches. Am I right or wrong??

 
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Scott
(Login 406-roller)
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There are many variables to take into account such as

January 26 2002, 7:25 AM 

which year and block...passenger car C6ME, mirror image 105 block, heavy duty 391FT block, etc...but there seems to be no real 100% fool proof method with out sonic checking the block. We had a C6me passenger car 390 block that would have only of had .095 wall left on the thrust side of a cylinder wall after a .030 bore because of bad core shift and this is a standard bore block. I currently am running a .080 over 105 block which comes out to 406cid. There are several past posts to this general question on over bore.

Scott

 
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Scott'71F-100
(Login 71f100)
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From what I found that block might be a ...

January 25 2002, 11:01 PM 

427 the code he shows that is on the timing cover traces back to a 427 block but there could be a totally diferent number on the block than the one on the timing cover. Anyway. Oh one more question what would you all say a motor like this is worth with tranny?

Scott

 
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Alan Casida
(Login AlanCasida)
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I am going to give him the benefit of a doubt...

January 26 2002, 3:29 PM 

and figure he meant to write 428 but due to a brain fart put in 390. But since I am not going to bid on it it doesn't matter. I would at least contact him first to see if that's what happened. My 2 cents anyway.

 
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