55 PASS CORVETTE 8 cyl 56 PASS w 2BC w valve rocker studs cast 3767460 3773010 2 38 80 56 PASS CORVETTE w dual 4BC w large ports cast 3731262 3734029 2 48 85 56 PASS CORVETTE w 4BC w valve rocker studs cast 3725306 small ports 3729785 2 38 80 57 59 PASS 283 exc 2BC Air S 57 60 CORVETTE right and lett 58 59 PASS w Air S right 60 61 PASS w 4BC 61 CORVETTE exc 1 1 right and lett cast 3774692 3776894 A R 41 25 57 61 ALL w 2BC 62 ALL 283 cast 3814480 3817682L 2 41 25 58 59 PASS Air S w 4BC 283 left cast 3760116 or 3755550 3758124 1 40 25 58 59 PASS w Air S 283 exc 4BC left cast 3755537 3758122 1 40 25 58 PASS 348 exc water cooled plugs cast 3759256 3759254 2 40 60 58 60 PASS w water cooled plugs 348 exc H Per 61 PASS w water cooled plugs 348 exc H Per w reg carn Sp H Per 3758379 2 40 60 59 60 PASS w H Per 348 cast 3758379 or 3767738 3785086 2 43 55 60 61 PASS wwSp H Per 348 61 PASS H Per w reg cam 348 cast 3781147 3785085 2 43 55 61 62 PASS 409 cast 3814690 3817082 T 2 64 50 62 63 PASS 327 exc H Per 62 63 CORVETTE exc H Per F l Sp H Per 63 ALL 283 cast 3795896 3817680 2 41 25 61 CORVETTE w Fl 62 63 PASS w H Per 327 2 63 CORVETTE w H Per Sp H Per 1 1 cast 3782461 3817681 2 47 50 63 Ser 10 D D 4 cyl cast 3824433 3793544 1 40 25 63 ALL 230 cast 3824437 3794084 1 52 50 63 ALL 292 cast 3799019 3794085 1 54 50 63 PASS 409 3814690 3824370 2 64 50 53 62 ALL CORVETTE 235 HEAD UNIT consists ot valve guides seats and temp gauge reducing bushing cast 3836848 1 3730415 1 56 70 54 62 ALL 261 HEAD UNTT consists of valve guides and temp gauge reducing bushing cast 3836850 3730416 1 56 70 EBNOTE When 3835543 is used tor replacement on 1941 49 it will also be necessary to use 45 degree exhaust valves NOTE 838539 Seat must be used on jobs w o hydraulic valve litters tNOTE When used on COMM models with H T 18 hole must be drilled tor oil cooler line NOTE Used with 3772668 valve rocker cover unit NOTE 1 Vhen using 3776895 on 1957 58 and early 1959 designs it will be necessary to use 3772668 valve rocker cover unit NOTE When using on 1960 thru 62 PASS it is necessary to drill and tap a 18 hole in cyl hd bosses for attach g air cond unit 1 tNOTE Do not use on early design 1961 409 engines NOTE When used on engines not equipped with valve stem oil shields it is imperative that valve spring shim 3764539 be used to compensate for the 030 ot extra space NOTE When using 3776894 on 1957 58 and early 1959 designs it will be necessary to use 3772669 Valve Rocker Cover Unit 0 283 GUIDE Inlet and Exhaust Valve Stem 41 62 ALL CORVETTE 6 cyl inlet 1 D x 2Q O D 3708168 6 65 38 40 ALL exhaust 23 lg length straight sides 368875969 6 55 41 62 ALL CORVETTE 6 cyl exhaust 2 length straight sides 3688761 6 60 NOTE To obtain proper valve stem clearance guides must be finished with 343 hand reamer alter installation in cylinder head 0 269 0 282 9 2 M Qxffi REV SED NOVEMBER 962 General Motors Corporation