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Thread: 402 bore over
          
   
   

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  1. 04-30-2009 02:28 AM #1
    steelsixpack101
    steelsixpack101 is offline CHR Member
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    402 bore over

     



    I was wondering can a two bolt main 402 BBC be bored out to a finished bore of 4.250" to create a 427. I believe the factory bore is 4.125". I know big blocks have thick cylinder walls. It would be a .0625" take off the cylinder wall on each side. I just wanna double check and get second opinions.
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  3. 04-30-2009 06:35 AM #2
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    pat mccarthy
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    No no no no
    Irish Diplomacy ..the ability to tell someone to go to Hell ,,So that they will look forward to to the trip
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  4. 04-30-2009 07:27 AM #3
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    HWORRELL
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    I did it once,In a pinch. Alky circle track motor. It lasted almost a season before it cracked a cylinder wall.
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  5. 04-30-2009 03:15 PM #4
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    pat mccarthy
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    the old 369 block s from 65 to 67 you could bore them out to a 427 or 454 4.250 and some say 125 on top of that for a 4.375 bore .but not all of them and the 402 block you would be on thin ice
    Last edited by pat mccarthy; 04-30-2009 at 03:23 PM.
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  6. 04-30-2009 03:33 PM #5
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    HWORRELL
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    Hey Pat,was the 402 a truck motor or something ? I know when I did it it was racing season and it was all I could find in a hurry. Never could figure out what they used it in. Or was it simply what they called the 400 big block ?
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  7. 04-30-2009 03:56 PM #6
    steelsixpack101
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    does anyone have a 454 block they wanna sell reasonbly priced..?
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