Block Casting #’s Description
177........................85-86……..4.3L…2 Piece Rear Main Seal.
This Is The Early Style
Block.
553,683………….86-88……..4.3L…1 Piece Rear Main Seal.
Non Roller Cam Engine.
011,867………….87-92……...4.3L…1 Piece Rear Main Seal.
Roller Cam Engine.
Has 2 Accessory
Mounting Holes
On Front Of Head.
535…...………....92-97………4.3L…Roller Cam Engine With
Balance Shaft. Has A
10 Bolt Front Timing Cover.
No Fuel Pump Hole. Balance
Shaft Casting Numbers Must
Be 10224542 Or 10172748.
Must Check Balance Shaft
Casting Number.
196,534……….95-99……….4.3L…Roller Cam Engine With
535,359 Balance Shaft. Has 6 Bolt
Front Timing Cover And
14 Bolt Oil Pan Rail.
756,073……….92-96………4.3L…Roller Cam Engine With
061 Wide Intake. Head Casting
Numbers 064, 209, 626,
Or 181 Last Three Digits.
4 Bolt Lifter Hold Down.
No Fuel Pump Hole.
090…………...96-99……….4.3L…Roller Cam Engine With
Balance Shaft. Has 6 Bolt
Timing Cover And 10 Bolt Oil
Pan Rail. Head Casting Number
772 Last Three Digits.
786,103………….87-92……….4.3L…Roller Cam Engine.
067,050 Heads Have 3 Bolt Hole
Accessory Mounting On
The Front of Each Head.
Head Casting Numbers
Are 786, 103, 067, And
050. This Engine Can Be
Used To Replace The
GM262LC.
196,534…………..92-97………4.3L…Roller Cam Engine With
359,535 Balance Shaft. Balance Shaft
Casting Numbers Must Be
10224541 Or 12550286.
90M…………….00-05……….4.3L…Roller Cam With Balance
Shaft. Has Roller Rockers.
Head Casting Should Be 113.
10 Bolt Oil Pan.