Belt Lengths 5.7.2025

	A	B	C	D	E	F	G	H	I	J	K	L	M	N	O	P	Q	R	S	T	U	V	W	X	Y	Z	AA	AB	AC	AD	AE	AF	AG	AH	AI	AJ	AK	AL	AM	AN	AO	AP	AQ	AR	AS	AT	AU	AV	AW	AX	AY	AZ	BA	BB
1	LS BELT LENGTH CHART
2	How To Video -->	How to Measure the Belt Length on Your LS Engine Setup
3	If 2 belt lengths are given, then the first number is the 105 amp case alternator. The number after the / is the 145+ amp large case alternator
4	Use Gates brand belts (or the belt will squeal)
5	Gates belt part numbers = K06 then belt length starting with a zero (K060770 = 77.0" belt) (K061100 = 110 inch)
6	Legend
7	blue = 3 bracket combo
8	X = not possible
9	Driver side → Passenger Side ↓	Factory Truck Alt/PS	Nothing or Electric Water Pump	551127	551193LS0	551321 & LS01	551353	551362	551512	551519	551519X	551519XL	551520	551521X (Corvette)	551523 / 551785	551527X	551527X & 551321	551527X & 551706	551527X & 551785	551566	551577	551581	551581-LS01	551596	551667 / 551668	551668T	551669 (668&785) (CAMARO)	551706	551747	551751	551769	551776	551777 (TRUCK)	551777-3DA	551778 (668+321)	551779	551785 / 551523	551787A	551787B	551791	551796	551846-LS01	551884	551885	551887	551971-LS3	BKT-LS-PS01	BKT-LS01-E1	BKT-LS01-E2	BKT-LS002	BKT-LS005	BKT-LS006	BKT-LS007	BKT-LS015
10	Nothing	X	X	X		X	X	X	35"	X	X		X	X	X	X	X	X	X	X	X	X	X	X	X	33.8"/34"	X	X	X	X	X	X	X		X	X	X	X	X	X	X	385K4	OE Len			X			56"
11	Factory Tensioner	92.3"/81"	X	X			77.5"/78.5"	84.5"	X	77.5"	77"		73"	78.5"/79.8"Corvette alt	X	X	X	X	X	75.5"	72"		X	X	55"		79"		76"	X	84"	X	92.3"(w/353 77.5") / 92.5"(w/353 78.5")	113"	75.5"	X	X	X	X	94"/93.5"	81.5"					X
12	551135-3 (LSA)	Too many variables
13	551136	X	43.6"	X		X	X	X	X	X	X		X	X	X	X	X	X	X	X	X	X	X	X	X		X	X	X	X	X	X	X		X	X	X	X	X	X	X					X
14	551137-LS71	109.5"/111"	X	X			94.5"/95.5"	101.5"	X	X	93.7"/94.5"		X	96"/96.8"	X	X	X	X	X	91.5" / 92.5"	88.8"/ 89.5"		X	X	72" / 71.5"		95.5"/ 96"	X	93"/96"	X	X		109.5"/ 111"	.	95.5"/ 96.5"	X	X
15	551177LS0		35"
16	551189 (LSA)		61" w/o 551316	.																																														95.6"				109"
17	551193LS0
18	551352	107.5"/109"	X	X		X	94.5"/95.5"	X	X	93.7"	94.5"		89"	95.5"	X	X	X	X	X	92"	89.5"	X	X	X	71.2"		95.2"	X	93"	X	X	X	107.5"(w/353 94.5") / 109"(w/353 95.5")	.	92"	X	X	X	X	101.5"	X					X
19	551399	X	X	X		68"	X	X	X	X	X		X	X	67"	X	X	X	X	X	X	X	65"	X	X		X	76.5"	X	X	X	X	X		X	X	67"	X	X	X	X					X
20	551472	107.5"/109"	X	X		X	94.5"/96"	102"	X	94"	94"		89.5"	97.5"	X	X	X	X	X	93"	90"	X	X	X	71.6"		95.5"	X	93"	X	X	X	107.5"(w/353 94.5") / 109"w/353 96"6)	.	93"	X	X	X	X	102"	X					X
21	551472LS0	109"/115"	X	X			96"/97.5"	103.5"	X	95.5"	95.5"	100"	91"	98.5"	X	X	X	X	X	94.5"	91.5"			X	73.5"		96.5"		94.5"	X	X		109"(w/353 96") / 110.5"(w/353 97.5")	.	94.5"	X	X	X	X	103.5"
22	551474	113"/113"	X	X			99.5"/100.5"	105.5"	X	99"	98.8"		94"	100"/101.5"Corvette alt	X	X	X	X	X	96"	94"			X	75.5"		99.5"		K060986	X	105"	X	113"(w/353 99.5") / 113"(w/353 100.5")	.	97"	X	X	X	X	104.5"
23	551494X	113"/114"	X	X		X	100"/101"	106"/107"	X	99"	99"/100"		94"	101.5"/102"Corvette alt	X	X	X	X	X	96.5"/ 97.5"	94.5"	X	X	X	76"/ 77"		100.5"/101"	X	98"/98.5"	X	105"	X	113"(w/353 100") / 114"(w/353 101")	.	97.7"	X	X	X	X	106.5"	X					X
24	551526	X	X	X		X	X	X	X	X	X		X	X	X	66.5"	68.5"	74"	68"	X	X	X	X	63"	X		X	X	X	X	X	61"w/527x-3	X		X	X	X	X	X	X	X					X
25	551526-LS01	X	X				X	X	X	X	X		X	X			73"	77"	71"	X	X			61"	X		X		X	X	X		X		X		X	X	X	X	X					X
26	* 551585X	110.5"/111.5"	X	X			96.8"/98.7"	104"	X	97"	95.5"		91"	98"	X	X	X	X	X	95"				X	73.5"		98"		95.5"	X	102.5"	X	110.5"(w/353 96.8") / 111.5"(w/353 98.7")	.	95.5"	X	X	X	X	104"
27	551587 & LS01	X	X				X	X	X	X	X		X	X		66"	69.5"		68"	X	X			63"	X		X		X	X	X		X		X			X	X	X	X					86.5"
28	551617X	93.5"/94.5"	X	X			78.5"/79.5"	85.5"	X	79"	79"		73"	79"	X	X	X	X	X	75.5"				X	55"		79"		77"		84.5"	X	93.5"(w/353 78.5") / 94.5"(w/353 79.5")	.	75.5"	X	X	X	X	86"	81.5"									95.5"
29	551668 OE Tension	X	X	X			X	X	X	X	X		X	X	79"	X	X	X	X	X	X				X		X		X	X	X	69"	X		X	X	79"	X	X	X	X					X
30	551750	X	X	101"		81"	X	X	X	X	X		X	X	79"/80"	X	X	X	X	X	X	X	78.5"	X	X		X	90"	X	87"	X	75.5"	X		X	X	79"/80"	X	X	X	X					X
31	551776	X	X	X		X	X	X	X	X	X		X	X	X	X	X	X	X	X	X	X	X	X	69"		X	X	X	X	X	X	X		X	X	X	X	X	X	X					X
32	551780	X	X	98.5"/ 100"		78.5"	X	X	X	X	X		X	X	78"	X	X			X	X	76.3"	76.5"	X	X		X	87.2"	X	X	X	73"	X		X	96.5"	77.5"	X	X	X	X					X
33	551789 (LSA)	X	X	X		X	X	X	X	X	X		X	X	X	X	X	X	X	X	X	X	X	X	X		X	X	X	X	X	X	X		X	X	X	105.5"	Too many variables	X	X					X
34	551792		X	X					X	X			X		X	X	X	X	X					X						X		X			100.5"	X	X	X	X	114"/114.5"
35	551797		X	X					X	X			X		X	X	X	X	X					X						X		X				X	X	X	X		37"
36	551799	X	X	86"		68"	X	X	X	X	X		X	X	67.2"	X	X			X	76"	66"	66"	X	X		X	77"	X	X	X	62.5"	X		X	89"	67.2"	X	X	X	X					X
37	551940	111"/112.5"	X	X			97.6"/99"	104.5"	X	X	97.5"		X	99"	X	X	X	X	X	95.5"	93.5"			X	75"W/ ribbed idler pulley		99"		96"	X		X	111"(w/353 97.6") / 112.5"(w/353 99")		98.5"	X	X	X	X
38	551972													99"
39	551972-508													99.7"																																				112.5"
40	*Camaro R4 has .75" larger pulley (must use larger belt)
41	LS KITS
42	551396	68"
43	551396LS0-3	68"
44	551396LS0WP-3	68"
45	551397	68"
46	551498-3	67"
47	551498LS0-3	66"
48	551498LS0WP-3	66"
49	551499-3	67"
50	551565	67"
51	551565LS0WP-3	77"
52	551569	68"
53	551569LS0-3	81"
54	551569LS0WP-3	81"
55	551570	68"
56	551573-3	63"
57	551573LS0WP-3	63"
58	551667EWP-1/-2/-3	50.5"
59	551669	79"
60	551769-1	84.5"/105"w/474
61	551778-3	75"
62	551778LS0-3	79.2"/80.5"
63	551795-2	114"-114.5"
64	551795-3	114"-114.5"
65
66	LS 4 Rib KITS
67	551137-LS74-1		37.4"
68	551137-LS74-2		37.3"
69	551137-LS74-3		37.8"
70	551197-LSA01		39.8"
71	551975-LS01		37.8"
72	551975-LS02		OE Length
73	551975-LSTR		370K4
74	551975-LSCR-1		41"(OE)
75	BKT-LS31-AC1		OE Length
76
77
78	Gen V - LT BELT LENGTH CHART						Gen V - LT BELT LENGTH CHART
79	Driver side → Passenger Side ↓	Nothing/ Electric Water Pump	L84 Idler & WP	551125	551129	551519-LT	551578	L84 Idler & WP & 474-LT-3
80	Nothing
81	L84 WP & Altern
82	551118	1178K6 (w/o A/C 1075K6
83	551118-7176	125.1"
84	551177-LT
85	551368	K061000
86	551474-LT					K060970
87	551519-LTT2-3							98.5"
88	551582					K061145
89	* 551585-LT
90	551943		74"				90"
91	BKT-LT01-AC1
92	BKT-LT018-3		74" no A/C
93
94	*Camaro R4 has .75" larger pulley (must use larger belt)
95
96	BBC Belt Lengths						SBC Belt Lengths
97	Kit	Belt #					Kit	Belt #
98	551421	#15395 (39.5 inch)					551360	36.5 inch
99	551449	#15385 (38.5 inch)					551411.0	44 inch
100	551496	#15450 (45 inch)					551522.0	43 inch