BBC stroker kits
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BBC stroker kits

  1. #1
    Senior Member TahitiRat's Avatar
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    Default BBC stroker kits

    I was looking at these BBC stroker kits and was woundering useing a stock 454 block for a 496 chevy stroker kit with the 4.25 stroke crank what do you have to bore the block to also is there any clearance issues with these cranks that have to be addressed also I saw a 540 kit also what block work has to be done with this thanks

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    496 kit is basically a drop in kit on standard and tall decks. the 540 kit will require a tall deck block, 4.5 clearenced oil pan , and grinding some on the block. whatever you do, make sure you clean up the bottom of each bore, the honing machine will leave the edges of the bore sharp, and that ain't good when you're pulling a pistons out that far

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    Senior Member TahitiRat's Avatar
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    So if use a 4.25 stroke crank and a .030 over block will it still be a 496 I figure that they are using a .060 over block for the 496 is this the case

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    Quote Originally Posted by TahitiRat View Post
    So if use a 4.25 stroke crank and a .030 over block will it still be a 496 I figure that they are using a .060 over block for the 496 is this the case
    496 is 4.25 x 4.310 bore (.060 overbore)

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    Senior Member TahitiRat's Avatar
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    So at .030 over you are looking at 490 right thanks

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    4.280 x 4.250 = 489 CID, still a very potent combo.
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    The best way for a 540 is 4.250 stroke and 4.500 bore but only after market blocks will take that bore.You can get in the mid 500 cid range with 4.500 stroke and .100 over and some block fill on a tall deck production block but imo there not that good of combo.

  10. #8
    cfm
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    Not really.

    The production 502 block will take a 4.375 stroke and a touch more bore than 4.500" to get you over 555cid's.
    Last edited by cfm; 07-10-2008 at 05:05 AM.

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    Senior Member TahitiRat's Avatar
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    Cool good info thanks

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    Senior Member VAMI's Avatar
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    Quote Originally Posted by cfm View Post
    Not really.

    The production 502 block will take a 4.375 stroke and a touch more than 4.500" to get you over 555cid's.
    True, Forgot about those, seems like most guys have 454 blocks to start with.

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    Senior Member tx-19's Avatar
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    Quote Originally Posted by cfm View Post
    Not really.

    The production 502 block will take a 4.375 stroke and a touch more than 4.500" to get you over 555cid's.
    thats what i am running.

  14. #12
    Senior Member H20MOFO's Avatar
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    Can you buy just a new 502 block or do you have to buy the whole short block? I realize there is used but I don't see em too often. Speaking of used 502's do you want to stay away from gen 5's?
    Another Hot Boat refugee

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    gn7
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    a new 502 GM block is only nickels cheaper than getting a Merlin or Dart with nodular caps, and not nearly as strong or take as big a bore.



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  16. #14
    cfm
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    This is where the different forms of motorsports don't hang out with one another often enough. I'm an I/O guy and thus come here to see what you guys are up to. You can learn from all and access different parts than you would with just one crowd.

    502's are used in heavy use in the inboard/outboard world. There are more of these being used than 454's. If not, then the same.

    Yes, I agree. If looking for a new block only, the aftermarket blocks become attractive.

    If looking for used 502's the I/O section in this sight is extremely small. After asking BD Marine (he seems to be very involved with I/O's) I would check sites like offshoreonly.com , speedwake.com , boatfreaks.com , and on and on and on and on. Maybe do a search for 'offshore boat forums.' Many of the above are much more active then this one.
    Last edited by cfm; 07-10-2008 at 05:14 AM.

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