building a sbc 400 one of the main caps do not line up correctly, what do i do

1990 CHEVROLET TRUCK
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ANDREW72400
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i am building an sbc 400 the 3rd main cap from the front will not go into place as the other ones do. it fits backwards,there is about a 16th of an inch till it falls into place. what do i do? the motor was running when pulled
Jun 2, 2012 at 10:17 PM
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HMAC300
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are you sure you didn't switch them by mistake? about the only thing you can do is to have it line bored or have someone that knows small blocks andmkae sure it's in correctly.Or if this is a used motor maybe someone else put the wrong cap in and put it backwards. the tangs on the bearings shold be on the same side, if they are then it's correct.
Jun 2, 2012 at 10:43 PM
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ANDREW72400
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this motor was never taking apart till i got it. caps are on right spot.one the one main when on backwars (arrow pointing back) the tangs on bearing are lined up when cap it turned around. i think it was put on wrong from factory but it was a good motor with 345k i got from original owner
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Jun 2, 2012 at 11:00 PM
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HMAC300
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as long as the tangs line up and crank turns easily it should be ok then
Jun 2, 2012 at 11:02 PM
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ANDREW72400
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DO YOU KNOW IF GM DID SCREW UPS LIKE THAT?its never been apart and i have build hundreds of small blocks and never seen that.
Jun 2, 2012 at 11:37 PM
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HMAC300
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small blocks came form 2 different plants, I have seen many screwups to mention. It may have been a block that was resent through the line because of something similar to that.
Jun 2, 2012 at 11:39 PM