Main Studs

Premium main studs for maximum loading

High-performance main studs are essential for engines subjected to extreme loads and high RPMs. Unlike standard bolts, main studs are made from stronger materials and feature increased diameter and length, providing superior clamping force and durability. This is crucial for maintaining precise alignment and preventing main bearing cap movement under intense pressure. By minimizing the risk of main cap walk and fretting, high-performance main studs help reduce friction, increase engine longevity, and allow for higher power outputs without sacrificing reliability.

Studs are required for maximum loading & reduced wear and tear on the block threads.
Aircraft quality 8740 chrome moly steel is used to produce premium grade,
race quality fasteners right in Milodon's own plant.
Ground and thread rolled after heat treat to assure exacting tolerances.
190,000 PSI tensile strength is equal to the most demanding of applications.
Kits include 4130 heat treated, parallel ground washers and high strength nuts.
The Milodon name is your assurance of quality and a part warranted 100% unbreakable.
Sold in complete sets.

*- MAIN STUDS -*	Factory 2 Bolt Main Caps	Factory 4 Bolt Main Caps	Milodon Angle Bolt Main Caps	Milodon Straight Bolt Main Caps
SMALL BLOCK CHEVY Main Studs
SB Chevy	81125	81115	81128	81130
SB Chevy with Windage Tray	81126	81117	81129	81131
BIG BLOCK CHEVY Main Studs
BB Chevy	81138	81135	81133	81140
BB Chevy with Windage Tray	81139	81137	81134	81141
FORD Main Studs
302	81155			81155
302 with Windage Tray	81156			81156
351W	81165		81175
351W with Windage Tray	81166		81164
351C - 351M - 400	81165		81169
351C - 351M- 400 with Windage Tray	81168		81170
390 - 427 - 428CJ	81175
429 - 460	81188		81188
429 - 460 with Windage Tray	81189		81189
CHRYSLER Main Studs
318 - 340 - 360	81185		81183
318 - 340 - 360 with Windage Tray	81186		81184
Mopar Small Block "R3" Race Block	81180
Mopar Small Block "R3" Race Block w / Tray	81181
383 - 440 Wedge	81185			81183
331 - 354 - 392 Early Hemi	81185		81183
426 Factory Hemi (Center Studs)	81205
OLDS Main Studs
400 -425 - 455, 350 Diesel	81215		81175
400 - 425 - 455, 350 with Windage Tray	81217
307 - 350 - 403 .	81216
307 - 350 - 403 with Windage Tray	81218
PONTIAC Main Studs
389 - 400 - 455	81221			81222
389 - 400 - 455 with Windage Tray	81223			81224
389 - 400 - 455 (Center Studs)		81222		81222
389 - 400 - 455 (Center Studs) with Tray		81224		81224
AMC Main Studs
290 - 304 - 343 - 360 - 390 - 401 V-8	81187
CADILLAC Main Studs
472-50	81229
AUSTRALIAN HOLDEN Main Studs
253 - 308 V-8	81145		81145
253 - 308 V-8 with Windage Tray	81146		81146
6 Cylinder Main Studs	81147

SUGGESTED TORQUE SPECIFICATIONS:
Always clean up block threads with a bottom tap (chasing tap) before installing main studs. Install studs with non-hardening thread sealer and use Loctite on mains. All nuts are torqued using oil as lubricant. Lightly seat studs into block at 10 ft./lbs (hand tight). Then torque nuts as follows:

• 7/16" @ 65 ft./lbs.

• 1/2" @ 85 ft./lbs.

• 9/16" @ 115 ft./lbs.

ENGINE STUD - 4 PACKS Genuine 190,000 PSI premium race quality engine studs are available in these handy 4 packs to replace either lost or damaged studs. These also provide studs for special applications for which there are no kits available. Bulk, unpackaged studs are available in minimum quantities of 50.
2 ³/₄" x 7/16"	81250	4" x 7/16"	81254
3" x 7/16"	81251	4 ¹/₄" x 7/16"	81255
3 ¹/₄" x 7/16"	81252	4 ¹/₂" x 7/16"	81256
3 ³/₄" x 7/16"	81253	4 ³/₄" x 7/16"	81257
5" x 7/16"	81258	4" x 1/2"	81275
5 ¹/₄" x 7/16"	81259	4 ³/₈" x 1/2"	81276
6 ¹/₈" x 7/16"	81260	4 ⁵/₈" x 1/2"	81277
6 ¹/₂" x 7/16"	81261	4 ³/₄" x 1/2"	81278
6.9" x 7/16"	81262	5" x 1/2"	81279
7 ¹/₄" x 7/16"	81263	5 ³/₈" x 1/2"	81280
2 ³/₄" x 1/2"	81270	6 ¹/₄" x 1/2"	81281
3" x 1/2"	81271	6 ¹/₂" x 1/2"	81282
3 ¹/₄" x 1/2"	81272	7 ¹/₄" x 1/2"	81283
3 ⁵/₈" x 1/2"	81273	8" x 1/2"	81284
3.8" x 1/2"	81274	8 ¹/₂" x 1/2"	81285

NUT AND WASHER KITS Same high quality parts used in Milodon complete head and main stud kits.
Nut and Washer Kit - 7/16" (10 pieces each)	82100
Nut and Washer Kit - 1/2" (10 pieces each)	82200
Washers Only - 7/16" (34 pieces)	82210
Washers Only - 1/2" (30 pieces)	82215
Nuts Only - 12 Point, 7/16" (10 pieces)	82230
Nuts Only 0 12 Point, 1/2" (10 pieces)	82235