Camaro Z28 V8-305 5.0L VIN F FI (1991)
3.
Measure the distance between the rocker cover mounting flange and the bottom of the coolant passages (front and rear) (see Figure).
4.
If the distance is less than 2.60 inches, replace the cylinder head(s) with the following part numbers.
LB9 V8 Engine, P/N 10159553
L98 V8 Engine, P/N 10159552
Parts are currently available from GMSPO.
Labor Operation:
T1800
Labor Time:
Inspect both cylinder heads
10.3
with A.C.
+.1
Clean part on vehicles with
>30,000 miles
+.3
Replace head (right or left)
.6
Replace both heads
1.1