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420 GM 454 V8 1987-1989 - Serial 0A398941 Thru 0B622418 - Cylinder Head And Rocker Cover

Section Drawing: (Hover or click to view larger)

Untitled Document
Ref. OEM Part # Hardin # Mallory # GLM # Other # Description Num Req. Superseded From Special Notes
1 821948T1         COVER ASSEMBLY, Rocker 2 821948A1 This Part is No Longer Available SN# 0A398941 THRU 0D725769
1 821948T4         COVER ASSSEMBLY, Rocker 2 821948A3 This Part is No Longer Available SN# 0D725770 THRU 0D937011
2 25-49767         GROMMET, Rocker Cover 2   This Part is No Longer Available No longer made, limited availability
3 24-70086         SPRING, Filler Cap 2
SN# 0A398941 THRU 0D725769 No longer made, limited availability
4 17345         CAP, Oil Filler 2 42336 SN# 0A398941 THRU 0D725769
4 36-811569         CAP, Oil Tank, Oil Filler 2
SN# 0D725770 THRU 0D937011
5 41598T         BREATHER, Rocker Cover 2 41598 This Part is No Longer Available 420 Models
5 41598T         BREATHER, Rocker Cover 2 14902 This Part is No Longer Available 425 Models
6 37-818991         DECAL, 420 Models 2

7 16-56766         STUD, (.250-20/.250-28 x 1.380) 14

8 12-39143         WASHER, (.253 x .625 x .0937) 14

9 11-8267089         NUT, (.250-28) 14 11-20361
10 27-14765   676-9-61311     GASKET, Rocker Cover 2
1
11 848263         PUSH ROD, Vavle 8
Intake
11 848266         PUSH ROD, Valve 8
Exhaust
12 843080         VALVE, Exhaust - Standard 8 13024
13 95820         STUD, Rocker Arm Valve 16
SN# 0A398941 THRU 0D725499
13 16-821836         STUD, Rocker Arm Valve 16
SN# 0D725500 THRU 0D937011
14 49132         GUIDE, Push Rod 8
SN# 0A398941 THRU 0D725499
14 881686         GUIDE, Push Rod 8 811586 SN# 0D725500 THRU 0D937011
15 24-13455T         SPRING, Valve 16 24-13455
16 843376         RETAINER, Valve Spring 16 98598
17 26-827645         SEAL, Valve Stem 16 15832 1
18 15-845669         SHIM, Valve Spring (.015) 16 15-54531
18 15-77624         SHIM, Valve Spring (.030) 8

19 96028         LOCK, Valve Stem (32 Keys) 1

20 69304T         ARM, Valve Rocker 16 69304 This Part is No Longer Available
21 11-848610         NUT 16 11-44481
22 938-816778T3         CYLINDER HEAD ASSEMBLY 2 938-816778 SN# 0A398941 THRU 0D725499
22 938-811529T1         CYLINDER HEAD KIT 2 938-811529A4 This Part is No Longer Available (.375) 425 Models
22 938-826363T1         CYLINDER HEAD KIT 2 938-8263632 This Part is No Longer Available (.437) 425 Models
23 821024T         VALVE, Inlet - Standard (2.250) 8 821024
24 8M0049045         GASKET, Cylinder Head 2 27-13687 SN# 0A398941 THRU 0D725499 1
24 879150139         GASKET, Cylinder Head 2 27-811546 SN# 0D725500 THRU 0D937011 1
25 10-8M0000463         BOLT (2.00 Inch) Cylinder Head 8 10-491061
26 10-8M0000482         BOLT, (4.125 Inch), Cylinder Head 24 10-49105
- 27-13218A1         GASKET SET 1
SN# 0A398941 THRU 0D725499
- 27-808730A98         GASKET SET 1 27-808730A92 This Part is No Longer Available SN# 0D725500 THRU 0D937011
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