In fact i need to know it is good to change it all these bearing even the clearence its still good i got a s4 87non turbo engine n326 and i just want to know that ! Thanks for the answer!

 

Bearings can have good clearance and still be bad. Look for damage, such as scoring, deep scratches, or signs of oil starvation. Replacing them isn't exactly what I call easy though. If yours look good and have good clearance (which most probably do if they were never ran without oil) then don't bother replacing them. Mine had scratches and scoring damage. I replaced them, but I had all the proper tools: Press, mazda tools for pressing the old bearings out/ new ones in, starett telescoping gages, calibrated starett micrometers (.0001" with carbide anvil and spindle faces,) and high grit sand paper to lap the new bearings to size, per Racing Beat instruction. It worked great, but it was VERY time consuming, and I couldn't have done it without the proper tools.

 

My god ! Too much to do! But thanks for ur experience!