0 728 GEAR SPROCKET Crankshaft Timing Steal 40 66 All 6 cyl exc 292 3836605 1 4 30 27 teeth 3V O D stamped 71 62 66 All 3 53 4 53 6V 53 5135275 1 18 79 idler timing L H Helix 62 69 All 3 53 4 53 6V 53 5116195 1 21 29 7 V O D x 4 I D 63 70 All 250 292 3882892 1 5 10 27 teeth Note 1 NOTE 1 On the 292 cu in engine prior to 1966 it will be necessary to discard camshaft gear 3866727 and replace with 3882893 Also replace the crankshaft front end cover with 3879688 65 69 All D351 D DH478 2454002 1 9 75 34 teeth 66 67 All 366 3860086 1 5 05 31 teeth 55 57 All 8 cyl exc 322 58 59 Ser 4 8 cyI 58 59 Ser 6 w L D 283 60 66 Ser 40 50 283 3759980 1 3 75 SPROCKET 18 teeth 56 59 All 322 1175130 1 7 40 SPROCKET 27 teeth 57 59 Ser 5 6 7 8 283 exc L D 60 66 Ser 60 283 327 67 68 All 327 69 70 Ser 50 350 3735413 1 5 25 SPROCKET 22 teeth Note 2 NOTE 2 May be used with 3735412 sprocket and 3735411 chain on early link type jobs 58 65 All 348 3740682 1 6 50 SPROCKET 45 teeth 62 65 Ser 80 409 3788201 1 6 95 SPROCKET 24 teeth 67 68 All 283 307 69 70 Ser 40 350 3896959 1 3 75 SPROCKET 18 teeth 69 70 All 366 427 3891518 1 6 70 SPROCKET 25 teeth 0 729 KEY Crankshaft Sprocket 56 59 All 322 1321045 1 30 1 long 65 69 All D351 D DH478 2380310 1 25 2 long 0 736 SPROCKET GEAR BEARING BUSHING HUB SHAFT SPACER Camshaft Timing 55 57 All 8 cyl exc 322 58 59 Ser 4 8 cyl 58 59 Ser 6 w L D 283 60 66 Ser 40 50 283 3865964 1 5 90 36 teeth 57 59 Ser 5 6 7 8 283 exc L D 60 66 Ser 60 283 327 67 68 All 327 69 70 Ser 50 350 3735412 1 6 70 44 teeth cast 3735412 Note 1 NOTE 1 May be used with 3735413 sprocket and 3735411 chain on early link type jobs 58 65 All 348 409 3740684 1 7 25 48 teeth cast 3740684 67 68 All 283 307 69 70 Ser 40 350 3896960 1 5 90 36 teeth 69 70 All 366 427 3891517 1 7 40 50 teeth 38 47 AII 48 52 All exc 2 Ton 3836156 1 11 45 GEAR fibre 54 teeth stamped 3836156 40 55 UtiI 55 62 All 6 cyl 3835473 1 9 15 GEAR a uminum cast 3835473 62 66 All 4 53 6V 53 5135275 1 18 79 GEAR w brg idler timing L H Helix 62 66 All 3 53 4 53 6V 53 5135277 1 23 45 GEAR camshaft Fl H Helix 62 66 All 3 53 4 53 6V 53 5135278 1 21 60 GEAR camshaft L H Helix 63 65 All 230 3866727 1 9 65 GEAR Ident No 3866727 63 70 All 250 292 3882893 1 9 65 GEAR cast 3866727 54 teeth Note 2 NOTE 2 On the 292 cu in engine prior to 1966 it will be necessary to discard crankshaft gear 3835371 and replace with 3882892 Also replace the crankshaft front end cover with 3879688 65 69 All D351 D DH478 2454018 1 21 80 GEAR camshaft timing 65 69 All D351 D DH478 2454014 1 17 85 GEAR camshaft idler 65 68 All D351 D DH478 2454007 1 6 45 GEAR balancer shaft 65 69 All D351 D DH478 2454010 1 15 35 GEAR bal shaft idler 66 68 All 366 427 3856351 1 5 70 GEAR 62 teeth 67 69 All 3 53 4 53 5133387 1 25 36 GEAR bal shaft R H Helix 67 69 All 3 53 4 53 5133388 1 25 36 GEAR camshaft L H Helix 67 69 All 3 53 4 53 5135227 1 20 05 GEAR ASSY idler timing L H Helix 62 69 AII 3 53 4 53 6V 53 5196793 1 3 16 BEARING idler 65 69 All D351 D DH478 2377668 1 70 BUSHING cam idler gear 65 69 All D351 D DH478 2454012 1 58 BUSHING bal shaft idler gear 62 69 All 3 53 4 53 6V 53 5124458 1 10 48 HUB idler 65 69 All D351 D DH478 2454016 1 14 85 SHAFT cam idler gear 65 67 All D351 D DH478 68 69 All DH478 611951 1 16 75 SHAFT bal idler gear 62 64 Ser 80 6V 53 5116220 1 4 50 SPACER idler gear hole 1 V 4 thick 0 738 BOLT NUT PlN PLATE RETAINER SPACER SL NGER WASHER Camshaft Sprocket 55 63 All 8 cyl exc 322 9408991 3 10 lock type 18 x 8 900 j 1971 CHEVROLET MOTOR DIVISION GENERAL MOTORS CORPORATION P A 313 REV 6 71 0 31 0 728 0 738