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Narrowing Main Bearing Caps

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  • asallwey
    replied
    Your right about needing it line bored due to the caps. However there is no point in you doing it. The machine shop that will do the line boring has a machine called a cap grinder that they use to adjust the fit of caps. Before they line bore they will have to fit your caps. After boring will come honing where the caps may have to be fine-tuned to achieve the proper clearance. Most times caps need a little tuning/grinding to bring them all into dimension.

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  • MikeL46
    replied
    My Mopar had pressfit caps. I'd guess at least .002 interference, maybe more..........I could not get them in; had to use the main bolts to pull them down. And they were the originals!

    I'd be reluctant to make them a slip fit.

    Mike

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  • gzig5
    replied
    There are aftermarket caps available but they need to be machined as well. If I can use these, I'll save ~$400.

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  • gzig5
    started a topic Narrowing Main Bearing Caps

    Narrowing Main Bearing Caps

    I found a standard bore 340 block with the correct date code for my 73 Plymouth Cuda. I got it cheap, but the down side is the main caps are from another, later motor. That means it will have to be line bored, which is fine, but I need to get these caps to fit the block. The block has a recess for the cap to set into and the caps are about .005 too wide so I need to remove about.003 off each side so they are a snug fit. I'm assuming they need to be a snug fit. That's a little much to stone off. Trying to figure out how to fixture the five caps together so I can do them all at once but I'm struggling. Only thing I can come up with is to stand them on end on a thin parallel in the notch, but the vise jaws would have to be 5" high. Originally, they were cast and machined in one block and then cut into individual caps. Appreciate any suggestions and if I have to do them one at a time, it is what it is.
    edit...the bores line up better with the cap flipped 180.
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