GM Service Manual Online
For 1990-2009 cars only

Vehicle

Engine Code

Engine Size

High Flow (Liters per Minute)

High Flow (Gallons per Minute)

Pressure Relief (kPa)

Pressure Relief (PSI)

G 10/20 Series

7200/8600 GVW with vacuum brakes

L35

L30

L31

4.3L

5.0L

5.7L

10.2/11.7

2.7/3.1

9825/10514

1425/1525

G 20/30 Series

Above 8600 GVW with hydroboost

L18

L65

8.1L

6.5L Diesel

11.7/13.2

3.1/3.5

9825/10514

1425/1525