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Rod Question

  1. #1
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    Default Rod Question

    Can you use a 6.135 stock rod with a 4" stock stroke in a tall deck block with the right pistons? Srp makes a piston that is a 4.530 to make a 515" motor. That's what I would like to build mainly because I have a good forged crank and carillo rods that I would like to use.


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  3. #2
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    Quote Originally Posted by SofaKingFast View Post
    Can you use a 6.135 stock rod with a 4" stock stroke in a tall deck block with the right pistons? Srp makes a piston that is a 4.530 to make a 515" motor. That's what I would like to build mainly because I have a good forged crank and carillo rods that I would like to use.


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    SofaKing, heres the math, FOR THE SECOND TIME, WRITE IT DOWN

    block deck height - 1/2 stroke - connecting rod length= piston compression height.

    I do not believe you are going to find an off the shelf piston you can use in a tall deck with a 4" crank and stock length rods. But if you should stumble over a set of pistons with the right compression height, they will weigh slightly less than a cylinder head.

    Why do you feel you need a tall deck with that stroke?



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    Last edited by gn7; 03-06-2014 at 10:19 PM.

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    I don't need a tall deck for the stroke I need it for the bore. As you can see I put 4.530, unless I'm missing something I didn't think you could bore a standard block that big. The piston part number is 212141 I believe. I'm not sure if I can use the stock stroke and stock rod combo with that piston that was question. I would prefer not to buy another set of expensive rods if I don't have too. I have these parts minus the pistons so I was curious if they work. I did not see a wrist pin height on the website for the pistons. I could only assume that the guys over at je would not offer a big bore piston with a stock crank and stock rod length if it didn't work. They call it out as being a 515 which I thought could only be accomplished using a tall deck or aftermarket block.


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  6. #4
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    Quote Originally Posted by SofaKingFast View Post
    I don't need a tall deck for the stroke I need it for the bore. As you can see I put 4.530, unless I'm missing something I didn't think you could bore a standard block that big. The piston part number is 212141 I believe. I'm not sure if I can use the stock stroke and stock rod combo with that piston that was question. I would prefer not to buy another set of expensive rods if I don't have too. I have these parts minus the pistons so I was curious if they work. I did not see a wrist pin height on the website for the pistons. I could only assume that the guys over at je would not offer a big bore piston with a stock crank and stock rod length if it didn't work. They call it out as being a 515 which I thought could only be accomplished using a tall deck or aftermarket block.


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    Were you thinking you could bore a GM truck tall deck that big? NO WAY!!
    You can make a 515 GM truck tall deck. Just not with that bore size, or that crank or rods



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    Last edited by gn7; 03-06-2014 at 10:42 PM.

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    Default Rod Question

    How big can you go? The block is already 4.500. I believe that it's a 572 block I could be wrong though.


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    Quote Originally Posted by SofaKingFast View Post
    How big can you go? The block is already 4.500. I believe that it's a 572 block I could be wrong though.


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    You already have a tall deck bored to 4.500? Then its is either an after market block, or a GM Bow Tie. Which technically is a after market block, they were never production
    It can be bored to 4.530, Do you know what block you have??

    But you won't find pistons to use those rods and crank together in a tall deck. You won't find any pistons to use those rods in a tall deck with any crank.

    Find another block, or find another set of rods.



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    Last edited by gn7; 03-06-2014 at 10:49 PM.

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    Ok so I need to buy different rods then, like 6.385 or 6.585 rods? With correct pistons of course. Is there an advantage to using a longer rod?


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  10. #8
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    Quote Originally Posted by SofaKingFast View Post
    Ok so I need to buy different rods then, like 6.385 or 6.585 rods? With correct pistons of course. Is there an advantage to using a longer rod?


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    6.535 is the minimum length. Then you use a piston with a 1.645 CH with the 4" crank.
    Yes there are some advantages to longer rods, but this isn't one of the cases. You are just adding weight to the assembly by making everything longer and taller than it needs to be. But it will work and pistons are available if you use 6.585 rods.



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    Last edited by gn7; 03-06-2014 at 11:01 PM.

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