I BOUGHT A 505" STRKER KIT FROM HUGHS ENGINES, RACE BALANCED. NOTHING NEEDED TO BE MACHINED OR CHANGED, ALL FIT GREAT, W/ NO CLEARACING OF THE BLOCK AT ALL. I RUN A MOTOR PLATE, AND DON`T HAVE ANY VIBRATION AT ALL. .620 LFT SOLID ROLLER TOO. (Pay no attention to the caps!)