Wanted 502 block
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Wanted 502 block

  1. #1
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    Default Wanted 502 block

    Looking for a good 502 Block. Anybody have anything?

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  3. #2
    Senior Member nordictom's Avatar
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    I have a BBC 4 bolt main block. I believe it's a GEN 4, 30 over 502.

  4. #3
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    The motor Im working on is a Gen VI I believe. I need to check and see about that for sure. Its a Mercruiser 502 MPI out of a 87 Baja.

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  6. #4
    Senior Member nordictom's Avatar
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    Here's a photo of the block.


  7. #5
    B.A.M aka "Black Azz Mike 396_Ways_To_Spit's Avatar
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    Quote Originally Posted by nordictom View Post
    I have a BBC 4 bolt main block. I believe it's a GEN 4, 30 over 502.
    Bore X Stroke = Cubic inches


    a 30over bore is a 4.280 bore

    a 502 block has a stock 4.468" bore and a 4.000" stroke(crank)
    G H E T T O F O E L I F E
    Quote Originally Posted by cave View Post
    They bout shit themselves when yelled in Messican, "No brakes no brakes."
    I showed them all the sticker on the side that reads "Driver Ricky Bobby" They just looked at me and nodded yes yes
    Quote Originally Posted by Kyle View Post
    Some peeps just build it 1 part, 1 week, 1 paycheck at a time

  8. #6
    B.A.M aka "Black Azz Mike 396_Ways_To_Spit's Avatar
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    here is a handy lil chart


    Big block Chevy bore and stroke



    Engine Size Stock Bore +.060"-over Stock Stroke
    366 3.935" 3.995" 3.760"
    396 4.094" 4.154" 3.760"
    402 4.125" 4.185" 3.760"
    427 4.250" 4.310" 3.760"
    454 4.250" 4.310" 4.000"
    Mrk5-502/Mrk6 4.468" 4.530" 4.000"


    454 Engines 3.760" 4.000" 4.250" 4.500" 4.750" 4.875"
    Stock bore = 4.250" 427" 454" 482" 511" 539" 553"
    Bored .030" =4.280" 433" 460" 489" 518" 547" 561"
    Bored .060" =4.310" 439" 467" 496" 525" 554" 569"
    Bored .090" =4.340" 445" 473" 503" 533" 562" 577"
    Bored .100" =4.350" 447" 476" 505" 535" 565" 580"
    Bored .125" =4.375" 452" 481" 511" 541" 571" 586"


    502 Engine 3.760" 4.000" 4.250" 4.500" 4.750" 4.875"
    Stock bore = 4.468" 472" 502" 533" 564" 596" 611"
    Bored .032" = 4.500" 478" 509" 541" 573" 604" 620"
    Bored .062" = 4.530" 485" 516" 548" 580" 612" 629"
    Bored .092" = 4.560" 491" 523" 555" 588" 621" 637"


    Brodix, Dart & Merlin Blocks 4.000" 4.125" 4.250" 4.375" 4.500" 4.625" 4.750" 4.875" 5.000"
    4.500" bore 509" 525" 541" 557" 572" 588" 604" 620" 636"
    4.530" bore 515" 532" 548" 564" 580" 596" 612" 628" 645"
    4.560" bore 523" 539" 555" 572" 588" 604" 621" 637" 653"
    4.590" bore 530" 546" 563" 579" 596" 612" 629" 645" 662"
    4.600" bore 532" 548" 565" 582" 598" 615" 632" 648" 665"
    4.625" bore 537" 554" 571" 588" 605" 622" 638" 655" 672"


    To calculate the displacement of an eight-cylinder engine: bore x bore x stroke x 6.2832

    Cubic inches x 16.387 = cubic centimeters. Cubic centimeters x .061 = cubic inches
    Last edited by 396_Ways_To_Spit; 03-06-2010 at 11:28 AM.
    G H E T T O F O E L I F E
    Quote Originally Posted by cave View Post
    They bout shit themselves when yelled in Messican, "No brakes no brakes."
    I showed them all the sticker on the side that reads "Driver Ricky Bobby" They just looked at me and nodded yes yes
    Quote Originally Posted by Kyle View Post
    Some peeps just build it 1 part, 1 week, 1 paycheck at a time

  9. #7
    B.A.M aka "Black Azz Mike 396_Ways_To_Spit's Avatar
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    I retyped all the 3 times and it wont keep it in a chart from
    G H E T T O F O E L I F E
    Quote Originally Posted by cave View Post
    They bout shit themselves when yelled in Messican, "No brakes no brakes."
    I showed them all the sticker on the side that reads "Driver Ricky Bobby" They just looked at me and nodded yes yes
    Quote Originally Posted by Kyle View Post
    Some peeps just build it 1 part, 1 week, 1 paycheck at a time

  10. #8
    Senior Member nordictom's Avatar
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    Quote Originally Posted by 396_Ways_To_Spit View Post
    here is a handy lil chart


    Big block Chevy bore and stroke



    Engine Size Stock Bore +.060"-over Stock Stroke
    366 3.935" 3.995" 3.760"
    396 4.094" 4.154" 3.760"
    402 4.125" 4.185" 3.760"
    427 4.250" 4.310" 3.760"
    454 4.250" 4.310" 4.000"
    Mrk5-502/Mrk6 4.468" 4.530" 4.000"


    454 Engines 3.760" 4.000" 4.250" 4.500" 4.750" 4.875"
    Stock bore = 4.250" 427" 454" 482" 511" 539" 553"
    Bored .030" =4.280" 433" 460" 489" 518" 547" 561"
    Bored .060" =4.310" 439" 467" 496" 525" 554" 569"
    Bored .090" =4.340" 445" 473" 503" 533" 562" 577"
    Bored .100" =4.350" 447" 476" 505" 535" 565" 580"
    Bored .125" =4.375" 452" 481" 511" 541" 571" 586"


    502 Engine 3.760" 4.000" 4.250" 4.500" 4.750" 4.875"
    Stock bore = 4.468" 472" 502" 533" 564" 596" 611"
    Bored .032" = 4.500" 478" 509" 541" 573" 604" 620"
    Bored .062" = 4.530" 485" 516" 548" 580" 612" 629"
    Bored .092" = 4.560" 491" 523" 555" 588" 621" 637"


    Brodix, Dart & Merlin Blocks 4.000" 4.125" 4.250" 4.375" 4.500" 4.625" 4.750" 4.875" 5.000"
    4.500" bore 509" 525" 541" 557" 572" 588" 604" 620" 636"
    4.530" bore 515" 532" 548" 564" 580" 596" 612" 628" 645"
    4.560" bore 523" 539" 555" 572" 588" 604" 621" 637" 653"
    4.590" bore 530" 546" 563" 579" 596" 612" 629" 645" 662"
    4.600" bore 532" 548" 565" 582" 598" 615" 632" 648" 665"
    4.625" bore 537" 554" 571" 588" 605" 622" 638" 655" 672"


    To calculate the displacement of an eight-cylinder engine: bore x bore x stroke x 6.2832

    Cubic inches x 16.387 = cubic centimeters. Cubic centimeters x .061 = cubic inches
    Thanks for the good info.
    Speed-O-Motive has alot of engine math on thier website.

  11. #9
    Senior Member varmit86's Avatar
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    Default

    what is the casting number on this block?

  12. #10
    Senior Member Cobra 02's Avatar
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    Have a (never used) new GM factory 502 short block sitting in the garage, been sitting for 5 years or so, How bad do you want it $$$

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