Measuring the Cylinder for Taper, Out-of-Round, and Oversize
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- Adjust the micrometer to a dimension slightly smaller than the bore size.
Adjust the micrometer to 96.0 mm (3.78 in) for 4.8/5.3 liter engines.
Adjust the micrometer to 101.62 mm (4.0 in) for 6.0 liter engines.
- Insert the bore gage into the micrometer and zero the bore gage dial.
- Use a bore gage and measure the cylinder bore for taper, out-of-round, and oversize.
Slide the bore gage up and down throughout the length of the cylinder bore. Check the bore both parallel and perpendicular to the centerline of the crankshaft at the top, center, and bottom of the bore.
A 4.8/5.3 L cylinder bore that measures 96.000-96.018 mm (3.779-3.78 in) may be honed and serviced with a standard size piston.
A 6.0 L cylinder bore that measures 101.618-101.636 mm (4.0007-4.0014 in) may be honed and serviced with a standard size piston.
A cylinder bore that exceeds the maximum diameter must be serviced with an oversized piston.