a n I 250 ENGINE AssaMeLv 0 629 PlS ON ASSEMBLY with Pin Refer to Piston Chart for model application S L NOTE individual piston assemblies are available for warranty purposes and for replacement of pistons damaged when making repairs to engine assemblies When ordering such parts it is necessary that you specify on your order the reason the parts are required and also that the following Note appear on your order Do not ship unit package quantity V NOTE See Dealer Price Schedule P A 26 for applicable prices 3 PISTON CHART I I STD s 001 0 8 020 030 0 8 71 AII exc L P Gas 3886048 3886049 3886051 71 All w L P Gas 3953798 72 All 6270033 6270034 6270036 0 643 RING UNIT Piston Service Sets A NOTE Individual cylinder piston ring units std size only for warranty replacement in a single engine cylinder may be ordered thru the local G M P D warehouse refer to ACNC6775 Identify by engine model and year Each of these std size piston ring units include the necessary components ring spacers segments expanders required for replacement in a Single Engine I Original Equipment Type Complete set for one engine per container STD 020 0 S 030 0 S 71 72 AII 326400 3892388 0 328503 0 646 CRANKSHAFT NOTE 1 When using on models with A 7Z remove clutch pilot bearing 71 72 All T 3876840 1 Note 1 1 0 649 BEARING Crankshaft Clutch Pilot M 71 72 All 3752487 1 bush type az O D x J 0 659 BALANCER PULLEY Crankshaft I I it NOTE In some cases double groove pulleys may be used in place of single groove pulleys 71 72 AII 3896590 1 71 72 All w P S Air Cond 3883263 1 PULLEY 1 groove 0 666 FLYWHEEL with Ring Gear y 71 72 C 4 exc A T 3998281 1 I 0 669 BOLT Flywheel to Crankshaft 71 72 All I 839756 6 20 x 1 u O L 290M steel 0 679 UNDERPAN EXTENSION Flywheel 1 71 72 All exc A T 3714477 1 clutch 15 wide I 71 72 Ser 40 exc SBC A T 3734908 1 EXTENSION clutch hsg under pan 0 683 HOUSING BOLT Flywheel and Clutch 71 72 Ser 40 3925507 1 clutch 71 72 All 3733130 2 BOLT clutch hsg attach s 16 x 2 washer hd 300M steel 3 275 g 0 685 DOWEL Flywheel and Clutch Housing to Cyl Block 71 72 All 3712745 2 clutch hsg z u dia x 1 long 0 728 GEAR Crankshaft Timing STEEL A 71 72 All 3882892 1 27 teeth 0 736 GEAR Camshaft Timing 71 72 All 3882893 1 54 teeth cast 3882893 or 3866727 0 748 NOZZLE Timing Gear Oil I I 71 72 All 3875950 1 1 u 0 L I 0 787 ROD BOLT CLIP END SWIVEL Clutch Fork Release 71 72 Ser 40 71 72 Ser 50 6 cyl 690588 1 fork push s 71 72 All 3910293A R BOLT 16 x 1 0 841 GM PARTS DIVISION GENERAL MOTORS CORPORATION CHEVROLET 72TM 0 629 0 787 0 sz g REV 5 79 i