[tom1394racing]

To make sure you have a good set of matching pistons and cylinders it is best to do the following:

1. Weigh all the pistons with their wrist pins and make sure the spread in weight (heaviest-lightest) is less than 8 grams

2. Measure the top ring clearance on each piston to make sure the it is within spec

3. Measure the piston diameters with a micrometer across the skirt, below the wrist pin

4. Measure each cylinder bore diameter with a dial bore gage in (4) places (top and bottom of stroke at 90 deg orientation).

5. Make sure the piston to cylinder clearance (cylinder diameter-piston diameter) is below 0.004"

If you meet all these criteria, you've got a good set.