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Old 05-27-2015, 03:34 PM   #1
Scooby Newbie
Member#: 419147
Join Date: Apr 2015
Chapter/Region: Tri-State
Location: Royersford, PA
2014 WRX
Plasma Blue Pearl

Default 2010 STI Block Main Housing Bore Issues

Hi guys,

Wanted to get some opinions from people who may of been through this. I have at our shop a 2010 STI Block that has already been rebuilt elsewhere but we are trying to get it done the best we can for this customer as he has bought all good parts for this thing.

So we put a measure on the housing bore's on the mains and there were 2 that were pretty big off of the Big side of the spec. Now I think torqued in some King MB5382XPG STD. Main bearings to see how big the clearances were. The thrust was .0009 which is too tight in my opinion. Then 2 others were .0032 so pretty big.

Have any of you been through something like this??

We are thinking the bottom halves of the block halves need to be resurfaced a few thousandths and then align hone to get them closer together and hopefully not as big.

This car is going to be a street car but be turned up pretty good making power so a little clearance won't scare me, but I figured .0032 is pushing it..

Let me know what any of you have been through! I appreciate any input!
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Old 05-28-2015, 02:56 PM   #2
Scooby Newbie
Member#: 376219
Join Date: Dec 2013
Location: southern Virginia
1977 5.4L MGB


Block needs line boring, not honing. Youtube search "Subaru line boring" shows it being done.
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