[Question] Questions about BBC bowtie block 14044808
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Questions about BBC bowtie block 14044808

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    Default Questions about BBC bowtie block 14044808

    A buddy of mine want to trade this old BowTie for some v-drive parts I have. My Old Chevy Powerbook said max bore is 4.56 and max bore is 4.25.Tall deck block. If I remember correctly the main oil galley is in the pan rail. Which will limit the stroke. Please educate me on if I can go over the Chevy spects with this block, I would like to put a 4.5 stroke with steel rods in it. in a 20' Schiada v-drive. so, I will need to live!
    Thanks.

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    Quote Originally Posted by boatguy222 View Post
    A buddy of mine want to trade this old BowTie for some v-drive parts I have. My Old Chevy Powerbook said max bore is 4.56 and max bore is 4.25.Tall deck block. If I remember correctly the main oil galley is in the pan rail. Which will limit the stroke. Please educate me on if I can go over the Chevy spects with this block, I would like to put a 4.5 stroke with steel rods in it. in a 20' Schiada v-drive. so, I will need to live!
    Thanks.
    You are walking a slack line if you try. With the RIGHT rod, and possibly some small grinding on the cap screw heads, and maybe some grinding on the rods outer area of the shoulder, and VERY careful grinding on the block, it will squeeze in there. Your better off letting a machine shop handle the clearancing on a mill. But it can be done with a hand grinder if you take your time and carefull. Lots of mocking up so you don't grind anymore than necessary.
    Heres a possible suggestion. The block will go 4.6, and you can always have it sonic checked the verfy it. A 4.56 X 4.5 is 588, and 4.5 X 4.375 is 581. How bad do you REALLY want that 7 inches. Plus you can have a slightly better rod ratio.



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    I run that block and it's at 4.610 bore And have had some come thru the shop at 4.630 this season. also my talldeck has 4.5 stroke and the lowdeck has the 4.250 stroke both of mine are filled to the bottom of the water pump holes with hard block.
    Last edited by havasubyou; 05-19-2013 at 08:28 PM.

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    Great info.
    Thanks

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    Quote Originally Posted by boatguy222 View Post
    Great info.
    Thanks
    I don't know what block havasubyou is running, but you can throw a 4.25 crank in an early MKIV bowtie from across the street, But you'll find out when you try to lower a 4.5 in there that you'll being doing some grinding, and much of it is right where the main oil gallery runs down the pan rail. Screw the pooch there, and your looking at a pricey sleeving, if they can even save it.



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    Quote Originally Posted by gn7 View Post
    I don't know what block havasubyou is running, but you can throw a 4.25 crank in an early MKIV bowtie from across the street, But you'll find out when you try to lower a 4.5 in there that you'll being doing some grinding, and much of it is right where the main oil gallery runs down the pan rail. Screw the pooch there, and your looking at a pricey sleeving, if they can even save it.
    I understand that is the pan rail / stroke issue with this block. one of the reasons I ask a question. I should be able to get it sonic checked to see what we can do with the bores. I take it by your earlier post the you think the 4.375 is better option?

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    Quote Originally Posted by boatguy222 View Post
    I understand that is the pan rail / stroke issue with this block. one of the reasons I ask a question. I should be able to get it sonic checked to see what we can do with the bores. I take it by your earlier post the you think the 4.375 is better option?
    Lets just say its SAFER. I take it that this thing is going in a v drive. RPM is not exactly the enemy of V drives it is to an I/O. It might not make the low RPM torque a 4.5" 588 will, but it will make up for it later in the band, If it was a big I/O I'd consider it. Even with a 4.375 you will do a little grinding, but no where as much at the oil gallery. Moving the oil gallery from the pan rail to the cam tunnel was more for crank clearance than crank oiling. The side oiler oils just fine. By moving it, they cleared the way for more stroke and gained a marginally better oiler. With the center oiler, you hit the camshaft before you run out pan rail.



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    Quote Originally Posted by gn7 View Post
    Lets just say its SAFER. I take it that this thing is going in a v drive. RPM is not exactly the enemy of V drives it is to an I/O. It might not make the low RPM torque a 4.5" 588 will, but it will make up for it later in the band, If it was a big I/O I'd consider it. Even with a 4.375 you will do a little grinding, but no where as much at the oil gallery. Moving the oil gallery from the pan rail to the cam tunnel was more for crank clearance than crank oiling. The side oiler oils just fine. By moving it, they cleared the way for more stroke and gained a marginally better oiler. With the center oiler, you hit the camshaft before you run out pan rail.
    OK thank for the education!

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    Mine is the bowtie tall deck with the same number the op has and it is milled for the 4.5 stroke.

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    Quote Originally Posted by gn7 View Post
    VERY careful grinding on the block, it will squeeze in there. Your better off letting a machine shop handle the clearancing on a mill. But it can be done with a hand grinder if you take your time and carefull. .
    Quote Originally Posted by havasubyou View Post
    Mine is the bowtie tall deck with the same number the op has and it is milled for the 4.5 stroke.
    Yeah, I probably should have mentioned that it can be done.



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    We have that same block and it is at 4.605 right now with a 4.5 stroke that we hand ground. I would take your time or have someone clearance it if you are set on that stroke. Bob brings up a good point with the 4.375" stroke. Good option.

    Paul

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    Quote Originally Posted by fc-Pilot View Post
    We have that same block and it is at 4.605 right now with a 4.5 stroke that we hand ground. I would take your time or have someone clearance it if you are set on that stroke. Bob brings up a good point with the 4.375" stroke. Good option.

    Paul
    4.5 x 4.375 - 557

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    My ProStock is made from that block. 4.625 bore, it was a blown engine at 4.5 x 4.5 ( minimal grinding in the pan rails ) .

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