Okay 05 Lq4 motor build, future turbo! Checked the Main Bearings with plastigauge and was on spot with .001 in, manufacturer tolerance is between .0008-.0021 With that being said I decided to check them with a dial and came up to roughly .0015. Question is am I too low or can I use these bearings? Most look to be running .002 and over for turbo builds and thereabouts. Bummer that it came up short! I just bought a brand new set of clevite bearings, and didn't want to buy another if I don't have to. Any thoughts or suggestions? I will also be running a Melling high volume pump 10296 maybe that will help with any offset...?

 

Why the hell would you consider using old rod bearings?

 

Actually I'm talking about main bearings... I bought a brand new set and I'm a little on the low side .0015 for a turbo build. Didnt want to have to buy "another" set. Was asking if it would still be acceptable since most will argue to stay closer to .002. Haven't installed the rod bearings yet and they are brand new as well.

 

Run thicker oil...

your within in specs from what you just said?

 

Well within GM specs, but they didn't create those tolerances with a turbo or high revving engine in mind. Was under the impression people were using thicker oil with larger tolerances?

 

thicker oil with bigger clearances. a set of dial calipers wont get you the accurate reading that you want .

 

I would run it. Honestly I wouldn't go passed .002 on the bearings. All the ones I have seen go loser then that with thicker oil Blew up.

 

Mine did...

Stock bearings here.

 

Thank you for the replies everyone! I will run them as is, if I were shooting for 1/4 mile times it would be a different story. Since this is more of street set-up I feel safe at .0015. What's the typical oil weight you all are running?

 

My apologies I meant a bore gauge... I confuse the two more often than I should.