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main bearing clearance ls1

This is a discussion on main bearing clearance ls1 within the Internal Engine forums, part of the LSx Technical Help Section category; I'm building my first ls engine and I installed the crank and checked the main bearing clearance with plastic-gauge and ...

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    Member crossbredfoxbody's Avatar
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    main bearing clearance ls1

    I'm building my first ls engine and I installed the crank and checked the main bearing clearance with plastic-gauge and I come up with .0015 on all but the 2nd journal It was .002 any help would be appreciated. Do they make bigger bearings like by 1 thousandth? I feel like I need more clearance this is a drag race only ls1.

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    Member importhater81's Avatar
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    .0008-.0025" is the service specs per G.M.I wouldn't sweat a .0005" difference on one journal.

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    Member importhater81's Avatar
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    They do make bearings by the .001' oversized,but as you stated you are building a drag only motor so I would think that the clearences you have now are good...Using that one oversized bearing on that #2 main will probably make that journal to tight.I'd stick with what you have.

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    Member crossbredfoxbody's Avatar
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    .00075 x 2.559=.00191925
    3/4 x Crank journal=
    Some people say use .010 x 2.559 Which is correct?

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    Member crossbredfoxbody's Avatar
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    High Performance engines on the other hand, typically employ
    greater bearing clearances for a number of reasons. Their higher
    operating speeds result in considerably higher oil temperatures and
    an accompanying loss in oil viscosity due to fluid film friction that
    increases with shaft speed. Increased clearance provides less
    sensitivity to shaft, block, and connecting rod deflections and the
    resulting misalignments that result from the higher levels of loading in
    these engines. Use of synthetic oils with their better flow properties
    can help to reduce fluid film friction.

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