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  #11  
Old 02-27-2013, 06:11 AM
63Tealbird 63Tealbird is offline
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Smile re 390 rebuild

Dave. Understand completely was thinking along the line of opening up oilpump passage and main journals how much did your shop have to take off in line hone stock size bearins for main journals or+ 10 just making notes have to replace rotting garage doors before work can start. No sense dropping door on bird as all paint and body work has already been done. Thank you again have to make some calls as friend and cousin have several birds for machine work recommendations
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  #12  
Old 02-27-2013, 09:13 PM
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simplyconnected simplyconnected is offline
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Jeff, interesting that you ask. Think about this: If you remove 0.010" from the crank, that's only five thousandths on each side. Five thousandths (.010" total) is only needed to clean up the surface and to make sure it's round. So, +10 bearings.

There is another consideration: Bearing caps tend to get tighter for some reason at the very bottom, but not so much at the bolt holes. So, the machine shop hones them back into specification. This doesn't take much metal removal. Main bearings should have .0015" clearance. That's one and one-half thousandths clearance. My 292 Y-block mains looked like new so I ordered +/-0" (std) bearing inserts. When I installed them, the crank was so tight I couldn't turn it with a wrench!

I realize the engine is 'seasoned' but, c'mon. Then my machine shop told me that this bearing cap tightness happens to practically all old engines. If I didn't see it for myself...

They call it, 'align bore' but in reality, they lightly hone the bearing saddles and caps. When finished you can see, metal was only removed from the top and bottom but not from the sides where the bolts go through. - Dave
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