Fitting Pistons
NOTE:
Take measurements with components at about 70°F (21°C). Engine block must remain at room temperature for at least 8 hours before taking measurements.
Cylinder taper must not exceed .010" (.25 mm). Out-of-round must not exceed .0015" (.0381 mm). If taper or out-of-round are beyond limits, or cylinder walls are deeply scored, hone or bore cylinders for new piston installation. See PISTON SIZE CODES chart.
PISTON SIZE CODES
| Size Code | Size: In. (mm) | |
|---|---|---|
| 5.0L | ||
| Red | 3.9991-3.9985 (101.577-101.562) | |
| Blue | 3.9990-4.0000 (101.575-101.600) | |
| .003" Oversize | 4.0008-4.0014 (101.620-101.636) | |
| 5.8L | ||
| Red | 3.9978-3.9984 (101.544-101.559) | |
| Blue | 3.9990-3.9996 (101.575-101.590) | |
| .003" Oversize | 4.0002-4.0008 (101.605-101.620) | |