[KPI]

I AM BUILDING A 350 FROM SCRATCH FOR THE FIRST TIME IN MY LIFE. I KNOW NOTHING, BUT WHAT I AM LEARNING FROM MAGS, MANUALS AND THE NET. I AM AT SOMEWHAT OF A ROADBLOCK. I HAVE BOUGHT (BOUGHTEN?) TWO DAMPERS, 1 OEM AND ONE CAT FLUID TYPE. NEITHER ONE SEEMS TO GO ON THE CRANK FAR ENOUGH TO HIT THE SEAL ON THE TIMING COVER. MY MICROMETER TELLS ME THAT THE DAMPERS ARE 6 AND 8 THOUSANDTHS SMALLER THAN THE CRANK SNOUT. WHAT TO DO? I DON'T REALLY WANT TO DISASSEMBLE THE ROTATING ASSEMBLY. CAN THE DAMPER BE MACHINED A LITTLE?