Main Bearing oil clearance question
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Newbie
Joined: Jun 2012
Posts: 1
Main Bearing oil clearance question
So picked up 88 z28 with a blow 305.
im building a 350 out of a k1500 (crate engine) to put it in
My main bearing clearance are all good except #4. Just had the crank polished & got new bearing all 123 and 5 are.025mm in spec but #4 is around .076 which is not in spec.
so my question is can i just get new bearing for #4 with out re grinding the whole crank?
I'm thinking get an under sized bearing of .026 mm am i right?
Can i just put an under size bearing on #4 where my problem is?
Spec i have are 2,3,4, .025-.064 ; 1 .025-.038 ;5 .064-.089mm (mitchell)
im building a 350 out of a k1500 (crate engine) to put it in
My main bearing clearance are all good except #4. Just had the crank polished & got new bearing all 123 and 5 are.025mm in spec but #4 is around .076 which is not in spec.
so my question is can i just get new bearing for #4 with out re grinding the whole crank?
I'm thinking get an under sized bearing of .026 mm am i right?
Can i just put an under size bearing on #4 where my problem is?
Spec i have are 2,3,4, .025-.064 ; 1 .025-.038 ;5 .064-.089mm (mitchell)
Tech Droid
Joined: Aug 2005
Posts: 9,215
From: North East PA
No problem with doing that, as long as the crank journal is OK and the main cap is not distorted, and you can find a proper size bearing, You should mike the crank journal and then order accordingly. From what you are saying #4 is .051 smaller than the other 3, so .026 under size will still result in excessive clearance.
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