Why would my block be filled with block filler?
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Why would my block be filled with block filler?

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    Member specrocz's Avatar
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    Nov 2009
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    Default Why would my block be filled with block filler?

    I picked up a 21' day cruiser last fall and ended up having to winterize before I could take it out for a spin. While winterizing, after pulling the exhaust manifolds and removing the drain plugs on the block, I discovered a hard solid material behind both plugs. My best guess is this is Block-fill. What I don't get is why would this be done to a marine 454 Chevy? The prior owner didn't know about it and so far doesn't have the information on the building of this engine. If anyone knows why fill a block and what benefits or liabilities of having a filled block there are, please reply to this post. Thanks..
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  3. #2
    Senior Member Teague Custom Marine's Avatar
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    Quote Originally Posted by specrocz View Post
    I picked up a 21' day cruiser last fall and ended up having to winterize before I could take it out for a spin. While winterizing, after pulling the exhaust manifolds and removing the drain plugs on the block, I discovered a hard solid material behind both plugs. My best guess is this is Block-fill. What I don't get is why would this be done to a marine 454 Chevy? The prior owner didn't know about it and so far doesn't have the information on the building of this engine. If anyone knows why fill a block and what benefits or liabilities of having a filled block there are, please reply to this post. Thanks..
    Email me a few pictures and I can help inform you of what you have. -Eric

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