Hello: It's been a while since I posted in CK5. I had to do some rehab because it absorbed so much of my time I'm glad to be back writing in this forum. I'm rebuilding the 350 which originally came in my 79 Blazer. It's going into my 1986 Camaro. I'm ready to assemble it with: -KB Silvolite 120 pistons .020 over -Total Seal TSS rings -Scat 4340 I rods -Stock crank .010 under both main and rod bearings -Pro topline 170cc 72cc cyl heads -Crane 216/228 compucam -TPI I'll be mostly using it as a daily driver with the ocasional race at the strip once in a while just for fun. The engine is ready for assembly. So far I measured these clearances at the main bearings: No.1 0.0025 No.2 0.0030 No.3 0.0025 No.4 0.0030 No.5 0.0020 What confuses me is that I don't know which recommended bearing clearances to use. http://www.chevytech.net/1c6o1.html recommends: No. 1 0.0008 - 0.0080 No. 2-4 0.0018 - 0.0020 No. 5 0.0010 - 0.0036 According to CHEVY PERFORMANCE SMALL BLOCK by John Baechtel, clearances for "high perf. stret" should be: 0.0025-0.0037 According to John Lingenfelter on Modifying Small-Block Chevrolet, clearances for a "daily driven small block" Mains 1-4: 0.0020-0.0025 No. 5 0.0025-0.0030 I know there are some experienced builders in this forums. Could you please tell me what to do in this situation? Any help greatly appreciated.