IH stamp on 318 block

Small Block Mopar Engine

  1. Junior340

    Junior340 Well-Known Member

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    I am pulling a 1977 318 that was in a Demon and noticed the symbol IH cast into sides of block.
    Is this a common find. Foundry? 20191105_142340.jpg 20191105_142331.jpg
     
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    • toolmanmike

      toolmanmike FABO Staff Staff Member FABO Gold Member

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      Those blocks were cast by International Harvester. John Deere here in town used to cast 2.5 4 cylinder blocks for GM back in the 80's. Pretty common.
       
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      • mbaird

        mbaird mbaird FABO Gold Member

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        I wonder if they have a higher nickel content then ?
        I had a machinest tell me he hated boring IH blocks because they were so damn hard !
         
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        • toolmanmike

          toolmanmike FABO Staff Staff Member FABO Gold Member

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          Probably so. Mopar always had higher nickel in their blocks. (compared to Chevy) LOL
           
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          • MoparMike1974

            MoparMike1974 Well-Known Member

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            There was a brief period in time where I was messing with a lot of small block fords (fox body mustangs). I remember that every 302 I tore down had a massive ridge at the top of the bores. The iron they used was like butter compared to mopar blocks.
            That IH block could possibly be from some farm equipment. I used to work at an Allis Chalmers dealer and saw quite a few slant six's in combines. Cant say I ever saw a 318 in anything except for boats. They were very common in boats.
            More than likely mopar farmed out the work to IH's foundry to keep up with production. Anyways, thats a cool block. Anyone else ever seen one of these?
             
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