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420 GM 454 V8 1987-1989 - Serial 0A398941 Thru 0B622418 - Cylinder Block And Camshaft

Section Drawing: (Hover or click to view larger)

Untitled Document
Note 1: Long Block Includes Internal Parts and Cylinder Heads. If Changing From Mark IV Style Engine To Generation V Style, An Update Kit Part Number 847818A4 Will Be Required.
Note 2: Gasket Sets Required For Complete Overhaul. Partial Engine Includes Only Standard Pistons, Piston Rings, Crankshaft Bearings And Camshaft Bearings.
Ref. OEM Part # Hardin # Mallory # GLM # Other # Description Num Req. Superseded From Special Notes
1 816185A17         LONG BLOCK ASSEMBLY 1   This Part is No Longer Available 420 And 425 Models - See Note 1 SN# 0A398941 THRU 0D725499
1 847705A14         LONG BLOCK ASSEMBLY 1 847705A13 This Part is No Longer Available 425 Models - See Note 1 SN# 0D725500 THRU 0D937011
1 842-9638         CYLINDER BLOCK ASSEMBLY 1   This Part is No Longer Available 420 And 425 Models - See Note 2 SN# 0A398941 THRU 0D725499
1 842-801999         BLOCK ASSEMBLY, Cylinder 1   This Part is No Longer Available 425 Models - See Note 2 SN# 0D725500 THRU 0D937011
2 22-32561         PLUG, (.250-18 x .41) 4 22-48340
2 22-48358T         PLUG, (.375) 2 22-48358
3 22-36382     700-21887   FITTING, (.250-18 x .62) Brass 2

4 22-69300         PLUG, Expansion (1.750 Inch) 8 19-37478
5 17-52190         PIN 4

6 19-94140         EXPANSION PLUG 1

7 23-85684         BEARING SET 1

8 93722T         LIFTER 16 93722
9 451-7892         CAMSHAFT 1

10 61728         CHAIN, Timing 1   This Part is No Longer Available SN# 0A398941 THRU 0D725499
10 845796T         CHAIN, Timing 1 811580 SN# 0D725500 THRU 0D937011
11 43-61726         SPROCKET, Camshaft 1   This Part is No Longer Available SN# 0A398941 THRU 0D725499
11 43-811578         SPROCKET, Camshaft 1
SN# 0D725500 THRU 0D937011
12 43-61727         SPROCKET, Crankshaft 1   This Part is No Longer Available SN# 0A398941 THRU 0D725499
12 43-845794T         SPROCKET, Crankshaft 1 43-811579 SN# 0D725500 THRU 0D937011
13 10-845942         SCREW, (.312-18 x .750) 3 10-35339
14 12-848136         WASHER 3 12-39167
15 17-843378         PIN, Dowel (.250) 1 17-35312
- 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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