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Thread: block fill

  1. #1
    Senior Member RACING JUNKIE
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    block fill

    a machine shop is building me a 385 forged short block, 6" h beam rods all 4340 stuff with 12.93to1 forged pistons

    what are the pros and cons to having the block filled ? I know it is 30lbs heaver but have heard its a good idea, any comments on this?

  2. #2
    Senior Member RACING JUNKIE BEAST477's Avatar
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    spib, you'll probably get mixed views on this. If it was mine i would hard block it at least a short fill. It will stiffen up the bottom end. If cooling isn't a problem i would fill it to the water pump holes. JMO
    BEAST477






    Only a rich man can afford to use cheap parts.

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  3. #3

    block filler

    definately recommended it adds rigidity to cylinders and stiffens the whole block.on a 350 block you won't have any cooling problems at all.

  4. #4
    Administrator RACING JUNKIE bjuice's Avatar
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    My opinion is leave it alone..at the compression your running there is no need for the filler,unless you plan on spraying it with a good dose of Nos or making it forced induction in the future.
    if NOS is in your plans go with a good cometic head gasket and head studs...matter of fact i would do this regardless

    like Beast said just My opinion
    Bjuice..

    "I'M YOUR HUCKLEBERRY ! "

  5. #5
    Senior Member RACING JUNKIE
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    i would not waste your block with fill

  6. #6
    Senior Member RACING JUNKIE
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    I agree don't do it.
    Now if you plan on putting a bunch of nitrous to it then yes by all means, other wise it's an unecessary expense.
    JMO, Cp
    ***IN GOD WE TRUST***

  7. #7
    Senior Member RACING JUNKIE
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    I talk to my builder yesterday makes it more rigid for $100, thats two bottles of fill and labor, I am filling it, its a done deal

  8. #8
    Senior Member RACING JUNKIE
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    I am with bjiuce on this one. No NO2 or blower insatlled
    I would stud the block and used good rod bolts
    JMO

  9. #9
    Senior Member RACING JUNKIE curtisreed's Avatar
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    We do fill our blocks now. We had a block break a cylinder wall and it was really thin on the thrust side. That was before we started sonic testing them. Now we do both on stock blocks. So if you do not fill the block I would recommend sonic testing the block. Again as said JMO.

    Curtis


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