Main Bearing Clearance

Rodzilla said
Its a street car, very little track time. 340 Stroked to 416. Shooting for 550-600HP 550 TQ. Will be Dyno'd. Eagle forged crank, recently balanced, polished and chamfered and apparently no one checked my clearances worth a crap. Glad I did my own plastigauge. This car will see 2000miles a year at most. Show quality resto, but still a driver for local cruising. I want to see .002" for clearance, I think that will be a good number to shoot for and for sure the .001" I have right now aint going to cut it. Redline will be 6800-7000. Oil will be a good quality 10-30 to start and later going to royal purple synthetic 10-30 as well. Oiling is via HV oilpump, oiling mods on sticky in this section done but I went with the bushed lifter bores.

Yow! Street car at 7k! Ok, I Gotcha... I really think you should be able to hit your stated goals at 6k but anyways, yeah, .0025 should be about right for your intended use. Did you plastigauge that crank at 90 degree intervals? If you did and all was the same, a good polish by a REPUTABLE crank guy will get you where you need to be. If you did not, and do and find an appreciable difference, that crank needs to reground .010 under to straighten out.

BTW, Kudos to you for asking and measuring! You did the right thing.

Break in with dino oil and then switch to synthetic after about 2k. :)