Mark 4 bow tie block ?
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Mark 4 bow tie block ?

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    Default Mark 4 bow tie block ?

    I found a new old stock, tall deck bowtie mark 4 block. It has the 4.9 bore. Acording to the gm sight it can only be bored to 4.56 and stroked to 4.25.. Any one out there know if a 4.5 stroke crank can be put in with out too much trouble. I assumed before I bought it that it could be bored to 4.6 and a 4.5 stroke would just drop in. Thanks

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    Quote Originally Posted by jungledave View Post
    I found a new old stock, tall deck bowtie mark 4 block. It has the 4.9 bore. Acording to the gm sight it can only be bored to 4.56 and stroked to 4.25.. Any one out there know if a 4.5 stroke crank can be put in with out too much trouble. I assumed before I bought it that it could be bored to 4.6 and a 4.5 stroke would just drop in. Thanks
    Well if it has a 4.9" bore, you're done already A 4.5" stroke will fit with steel rods. Needs a lot of clearancing but I didn't need a small base circle cam to clear. I'm pretty sure it will go to 4.6" bore, ours was 4.560 and was fine..... at least until it blew up
    Quote Originally Posted by gn7 View Post
    ....... David 519 is 100% correct........

    Quote Originally Posted by fuelinmyveins82 View Post
    .....I think people forget that racing is supposed to fun. Losing shouldn't be discouraging it should motivate you work on your pile to make it faster.....

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    Well I guess I forgot a 4. I knew they came with a 4.24 or 4.49 bore new. This is a 4.49 version so I'll just need to have it final honed but was just making sure it wouldn't take too much to put in the 4.5 crank. It has been filled to the bottom of the waterpump holes, part of why it was so cheap. The owner has had it for about for years. He said it was the last of the gen 4s from burts. Not too crazy about the mark 4 oiling though. Thanks
    Last edited by jungledave; 02-03-2009 at 07:58 PM. Reason: grammer

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    Default tall deck

    Thats the block I run. Have three of them. All 4.25 stroke, no issues. only 4.320 bore though. Left some room to grow. OPnes ready for a rebore, but the stud threads are now the issue, leaving it for a basic low HP unit. No more turbo's on this block.

    Jerry

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    OPnes??

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    this is the block i run also 4.610 bore x 4.500 stroke and filled to the water pump holes .400 long h-beam and lots of grinding to fit, not a drop in but worth the work good luck. ill try and dig up some pics and post of bottom end.

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    How on earth do you guys have these blocks? I have been around the performance world and never even heard of one, much less seen one.
    This should be a comfortable 4.650 bore with lots of extra room. Also with the 4.9 stuff it should be a DRCE pan rail which should have tons of room for that 4.500 stroke.
    I never knew they made anything like this in any configuration that could be considered a tall deck. What is the casting number on this baby? I gotta do some homework. I am so friggin' confused

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    Quote Originally Posted by Wannabe View Post
    How on earth do you guys have these blocks? I have been around the performance world and never even heard of one, much less seen one.
    This should be a comfortable 4.650 bore with lots of extra room. Also with the 4.9 stuff it should be a DRCE pan rail which should have tons of room for that 4.500 stroke.
    I never knew they made anything like this in any configuration that could be considered a tall deck. What is the casting number on this baby? I gotta do some homework. I am so friggin' confused
    Buzzz,
    4.49 bore, not 4.9 bore spacing. Big difference there chief.

    Paul

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    I sold one of these early Bowtie blocks on eBay last week for $560. I thought it would have brought a lot more.

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    Quote Originally Posted by fc-Pilot View Post
    Buzzz,
    4.49 bore, not 4.9 bore spacing. Big difference there chief.

    Paul
    Quote Originally Posted by Wannabe View Post
    I am so friggin' confused
    just a wee bit. I'm soooooooo confused!



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    Last edited by gn7; 02-04-2009 at 08:08 AM.

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    Quote Originally Posted by Wannabe View Post
    How on earth do you guys have these blocks? I have been around the performance world and never even heard of one, much less seen one.
    This should be a comfortable 4.650 bore with lots of extra room. Also with the 4.9 stuff it should be a DRCE pan rail which should have tons of room for that 4.500 stroke.
    I never knew they made anything like this in any configuration that could be considered a tall deck. What is the casting number on this baby? I gotta do some homework. I am so friggin' confused
    144044808 probably.

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    Quote Originally Posted by hotrod56cars View Post
    I sold one of these early Bowtie blocks on eBay last week for $560. I thought it would have brought a lot more.
    Damn, I wish I had known you had it. I'd have given you more than that if it was a tall deck.... Looking for one to use up a bunch of parts I have laying around and build a lake motor.
    Quote Originally Posted by gn7 View Post
    ....... David 519 is 100% correct........

    Quote Originally Posted by fuelinmyveins82 View Post
    .....I think people forget that racing is supposed to fun. Losing shouldn't be discouraging it should motivate you work on your pile to make it faster.....

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    Not sure if this link would work for others since it's out of "my eBay" page...
    http://cgi.ebay.com/ebaymotors/ws/eB...%3AIT&viewitem=

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    Default Thread Hijack Alert!!!

    Quote Originally Posted by flat601 View Post
    this is the block i run also 4.610 bore x 4.500 stroke and filled to the water pump holes .400 long h-beam and lots of grinding to fit, not a drop in but worth the work good luck. ill try and dig up some pics and post of bottom end.
    Hey flat, looks like a nice Fender collection in your avatar. I have a couple parts-o-caster hard tail Strats built from mostly new Fender Deluxe/Am series parts. These days I'm jonesing hard over a tele after selling mine a year or so ago. Unfortunatly I'm playing mostly bass in a couple blues/classic rock projects so it's hard to justify a $800-&1000 guitar when I already have a couple I'm not playing much.
    Strats-n-flats.... don't get much better than that!!!


    Sorry for the hi-jack and back to your regular scheduled programming!!!
    Quote Originally Posted by gn7 View Post
    ....... David 519 is 100% correct........

    Quote Originally Posted by fuelinmyveins82 View Post
    .....I think people forget that racing is supposed to fun. Losing shouldn't be discouraging it should motivate you work on your pile to make it faster.....

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