250 cu in 3 8750 STD S 4 3 8750 to 3 8755 5 3 8755 to 3 8760 250 cu in 3 8760 001 S 6 3 8760 to 3 8765 S 7 3 8765 to 3 8770 261 cu in 3 7500 STD S 4 3 7500 to 3 7505 S 5 3 7505 to 3 7510 261 cu in 3 7510 0O1 S 6 3 7510 to 3 7515 S 7 3 75 15 to 3 7520 265 cu in 3 7500 STD S 4 3 7500 to 3 7505 5 3 7505 to 3 7510 265 cu in 3 7510 0O1 S 6 3 7510 to 3 7515 S 7 3 7515 to 3 7520 283 cu in 3 8750 STD S 4 3 8750 to 3 8755 S 5 3 8755 to 3 8760 li 283 cu in 3 8760 0O1 S 6 3 8760 to 3 8765 7 3 8765 to 3 8770 292 cu in 3 8730 STD S 4 3 8730 to 3 8735 S 5 3 8735 to 3 8740 292 cu in 3 8740 001 S 6 3 8740 to 3 8745 7 3 8745 to 3 8750 307 cu in 3 8750 STD S 4 3 8750 to 3 8755 S 5 3 8755 to 3 8760 307 cu in 3 8760 001 S 6 3 8760 to 3 8765 S 7 3 8765 to 3 8770 327 cu in 4 0000 STD S 4 4 0000 to 4 0005 S 5 4 0005 to 4 0010 327 cu in 4 0010 001 S 6 4 0010 to 4 0015 S 7 4 0015 to 4 0020 348 cu in 4 1250 STD S 4 4 1250 to 4 1255 S 5 4 1255 to 4 1260 348 cu in 4 1260 001 S 6 4 1260 to 4 1265 S 7 4 1265 to 4 1270 350 cu in 4 0000 STD S 4 4 0000 to 4 0005 S 5 4 0005 to 4 0010 350 cu in 4 0010 001 6 4 0010 to 4 0015 S 7 4 0015 to 4 0020 366 cu in 3 9355 STD S 4 3 9355 to 3 9363 S 4 3 9363 to 3 9367 366 cu in 3 9371 001 6 3 9371 to 3 9379 S 7 3 9379 to 3 9387 396 cu in 4 0920 STD S 4 4 0920 to 4 0925 S 5 4 0925 to 4 0930 396 cu in 4 0930 001 S 6 4 0930 to 4 0935 S 7 4 0935 to 4 0940 409 cu in 4 3100 STD S 4 4 3100 to 4 3105 S 5 4 3105 to 4 3110 409 cu in 4 3110 001 S 6 4 3110 to 4 3115 S 7 4 3115 to 4 3120 427 cu in 4 2488 STD S 4 4 2488 to 4 2493 S 5 4 2493 to 4 2498 427 cu in 4 2498 001 5 6 4 2498 to 4 2503 S 7 4 2503 to 4 2508 NOTE The above chart is for information purposes only PISTON CHART STD 001 0 S 0200 8 030 0 S 040 O S 41 53 All 216 605276 41 52 All 235 53 63 All 235 3707473 3707454 3707455 3707456 55 56 All 265 3732021 3732023 3732027 37 32029 54 58 All 261 3758650 3707474 3758654 55 62 All 261 3758652 3758653 56 59 All 322 3752042 5 3752044 57 59 All 283 exc light duty 60 61 Ser 60 283 3758663 3758664 3758665 3758666 3758667 58 61 All 348 3752631 3752633 3752634 59 Ser 6 w light duty 283 60 63 Ser 40 50 283 3860407 3739888 3860417 3860426 3860432 59 62 AII 261 3758650 3758651 3758654 62 68 All 327 3 816974 3816975 3816976 3816977 62 65 All 348 3816650 3816651 3816647 3816648 3816649 62 65 All 409 3816640 3816641 3816637 3816638 3816639 62 64 Diesel 1st design 5 T95931 63 Ser 50 283 64 67 All 230 283 3860407 3860413 3860417 3860426 3860432 63 70 All 292 exc L P Gas 3794494 3794495 3794496 3794497 3794498 64 67 All 3 53 4 53 6V 53 2nd design 5198877 66 70 All 250 exc L P Gas 3886048 3886049 3886050 3886051 66 70 AII 366 exc L P Gas 3886172 3886173 3886174 3886175 68 70 All 427 3893251 3893252 3940955 3893253 68 All 307 3927120 3927121 3927122 3927123 69 70 All w L P Gas 366 3955294 3955295 3955296 3955297 69 70 All w L P Gas 350 3947746 3947748 3947750 3947752 69 70 Ser 40 250 w L P Gas 3953798 3962006 69 70 All 292 w L P Gas 3962018 3962019 69 70 All 350 exc L P Gas 3947786 3947787 3947788 3947789 21 to 1 comp ratio Consists of 1 Piston Assy w bushing and 2 piston pin retainers These numbers have four ring grooves Four cast valve relief pockets in top of each piston Balance weight unit 3751840 must be used with initial installation of these pistons See Group 0 662 17 to 1 comp ratio STD STD STD 005 O S 020 0 S 040 0 S cyls 1 2 cyls 3 4 cyls 5 6 all cyls all cyls all cyls 65 66 All D351 2464858 2464859 2464860 2472216 2464854 2464855 65 69 All D DH478 2464861 2464862 2464863 2472217 2464856 2464857 0 633 BUSHING NOZZLE Piston 62 69 All 4 53 6V 53 5116181 A R 85 rod and pin bronze 1 O D x 62 69 All 3 53 4 53 6V 53 5150140A R 45 NOZZLE piston spray 1971 CHEVROLET MOTOR DIVISION GENERAL MOTORS CORPORAT ON P A 31S 0 629 0 633 0 26 REV 5 71