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Whats block filler/sealer for?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by fr8train, Apr 25, 2002.

  1. fr8train

    fr8train 1/2 ton status

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    Ok I have now passed the 5 gallon tub 1 too many times now. What the heck is block filler/sealer for and why would I use it? Obviously its a filler for blocks!?!?!?! /forums/images/icons/laugh.gif Why should have it in my shop?
     
  2. Sparky

    Sparky 1/2 ton status

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    Not sure if youa re talking about the same thing, but a lot of drag racers fill their blocks so the coolent only cools the heads. This means less pinging cause they stay cooler and more power.

    Sparky
     
  3. BASSMAN

    BASSMAN Registered Member

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    Not sure if this is what you have, there is a filler/sealer for painting cinder block. Fills the pores of the block, makes painting a lot easier.
     
  4. fr8train

    fr8train 1/2 ton status

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    The tub says Cor-Lokt.
     
  5. NITRO

    NITRO 1/2 ton status

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    we use block filler when we bore the cylinders 1.00 or more. it is basically like cement. u fill up the bottom half of the block and let it dry. we do this in the 555cid engines that we use for mud boggs/drags. But, it isnt for ur everyday beast. between races we must spray water on the radiator in order to keep it cool. Its kinda a PITA but, it wins races.

    NITRO
     
  6. HarryH3

    HarryH3 1 ton status Author

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    Drag racer-types use it to minimize flexing of the block at extremely high RPM's and horsepower levels. It gets poured into the coolant passages, then it hardens around the cylinder walls. You wouldn't want to use it in a daily driver though, since it prevents water from reaching lots of the areas where it needs to be to keep things cool. The drag racers just run the engine for a minute or so tops, then shut it down to cool off between rounds.
     
  7. DesertDueler

    DesertDueler 1/2 ton status

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    You can do a 1/4-1/2 fill on a block and still drive it on the street. It strengthens up the blocks considerably, and alows you to get away with alot more hp without breakage. I fill the bottoms of street/strip cars to help them out, and they dont overheat here in AZ.

    Dan
     

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