454 CID (7.4L) / 502 CID (8.2L) SERVICE MANUAL NUMBER 23
Page 3A-82
90-861326--1 MARCH 1999
3. Measure cylinder walls for taper, out-of-round or excessive ridge at top of ring travel.
This should be done with a dial indicator or inside micrometer. Carefully work gauge up
and down cylinder to determine taper and turn it to different points around cylinder wall
to determine out-of-round condition. If cylinders exceed specifications, boring and/or
honing will be necessary.
72385
a
b
a
b
Cylinder Measurement
a-At Right Angle To Centerline Of Engine
b-Parallel to Centerline Of Engine
“Out Of Round” Equals The Difference Between “a” and “b”
Measurement At Top Of Cylinder Bore and
Measurement At Bottom Of Cylinder Bore
72570
Measuring Cylinder Bore With Telescope Gauge
72569
Measuring Cylinder Bore With Dial Indicator
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