I I I 250 ENGINE ASSEMBLY I I A I I 0 296 VALVE Inlet l A I I r Refer to following Chart for Model Application I I NOTE See Dealer Price Schedule P A for applicable prices l I A VALVE CHARTI lnlet I I STD 003 A I 015 0 S A 030 0 S I 66 68 All 250 I 3989083 3995684 3995685 3995686 89 72 All Blazer 250 exc V A A L P Gas s 3989088 3997749 3997750 3997751 69 72 All w L P Gas 3989086 3994295 3994296 3994297 A 0 297 VALVE Exhaust I I I I Refer to following Chart for Model Application I NOTE See Dealer Price Schedule P A 26 for applicable prices I B A A VALVE CHART Exhaust I I I STD 003 o s 015 O S 030 0 8 68 72 All Blazer 250 exc B l L P Gas B 329275 3995602 3995603 3995604 69 72 All w L P Gas 250 3989089 3997726 3997727 3997728 0 303 SPRING Valve I I A A I 68 72 All Blazer 250 3664895 12 inlet and exhaust 2 dauba of orange plus B stripe of aluminum dark green purple or I A Sn A 0 308 SEAL SHIELD Valve Spring Cap I B A 68 72 All Blazer 250 3835333 A R V 0 ring inlet and exhaust 68 72 All Blazer 250 T 3838755 A R SHIELD cup shape I D x 1 f 0 0 A 0 309 CAP Valve Spring A A A NOTE 1 Used with necked down stems Full dia stem on some models require cab 3776967 88 70 All Blazer 250 3729383 A R inlet and exhaust 1 OLD stamped H I A A Note1 0 310 KEY Valve Stem I B 68 72 All Blazer 250 Q 838029 A R U shape l I 0 333 ARM Valve Rocker with Adjusting Screw and Nut B 88 72 All Blazer 250 5723551 A R inle t and exhaust A 0 386 I COVER ASSY GROMMET VaIve Rocker Ar m A 68 70 All Blazer 250 3980229 1 B 71 72 All Blazer 250 3994204 1 w grommet 86 67 All 250 B B 70 72 All Blazer 250 3894337 1 GROMMET cover to a cl I D x B A A 1 0 0 I 0 413 BOLT REINFORCEMENT Valve Rocker Cover and Support Alsosee Group 0 366 I NOTE 1 Use with Bolt 180016 I B 88 72 All BIazer 250 180018 1 4 20 x V 8 900 66 72 All Blazer 250 3877670 AR REINFORCEMENT 1 0 L Note 1 A 0 42I3 GASKET Valve Rocker Cover 66 72 All Blazer 250 3930912 1 I 0 426 ROD Valve Push I B A 66 72 All Blazer 250 A 3768495 A R 9 0 L A B 0 429 B BALL NUT STUD Valve Push Rod Adjusting I I 66 72 All Blazer 250 3992294 1 dia j 68 72 All Blazer 250 3744341 16 NUT valve rocker arm l 24 I across the flats x z thk GM PARTS DIVISION GENERAL MOTORS CORPORATION CHEVROLET 72Tl g 0 296 0 429 0 28 B B REV 5 79