2024 ARP Catalog

73 WARNING: Cancer and Reproductive Harm - www P65Warnings ca gov s l California Residents WARNING: Cancer www P65Warnings ca gov Application High Performance Pro Series Stainless Hex 12-Point Hex 12-Point Hex 12-Point AUDI - SEE VOLKSWAGEN, PAGE 77 AMC 258 cid inline 6 with 1/2˝ bolts, all same length 112-3601 s 290-343-390 cid (1969 and earlier) 7/16˝ 114-3601 s 290-343-390 cid (1969 and earlier) with Edelbrock heads 7/16˝ 114-3605 s 304-360-390-401 cid (1970 & later) 1/2˝ 114-3602 s 304-360-390-401 cid (1970 & later) with Edelbrock heads 1/2˝ 114-3604 s 401 cid with Indy heads 114-3603 s BUICK V6 Stage I (1977-85) 123-3601 s123-3701 s 223-3701 s423-3601 l423-3701 l V6 Grand National and T-Type (1986-87) 123-3603 s123-3703 s 223-3703 s V6 with 1986-87’ block and GN1 Champion heads 223-3705 s V6 Stage II 223-3700 s V6 Stage II with Champion heads 223-3704 s V6 with Duttweiler and M&A aluminum heads 123-3602 s 350 cid 120-3601 s 350 cid (black oxide inner rows, stainless steel outer row) 420-3601 s 455 cid 125-3601 s CATERPILLAR C15 138-3701 s HEAD STUDS vs. BOLTS...A TECHNICAL DISCUSSION ARP’s factory Tech Representatives are often asked which is better, cylinder head studs or bolts. The answer, invariably, depends on the installation. On many street-driven vehicles, where master cylinders and other items protrude into the engine compartment, it’s probably necessary to use head bolts so that the cylinder heads can be removed with the engine in the car. For most applications, however, studs are recommended. And for good reason. Using studs will make it much easier to assemble an engine (especially a racing powerplant which must be serviced frequently and quickly!) with the cylinder head and gasket assured of proper alignment. Studs also provide more accurate and consistent torque loading. Here’s why. When you use bolts to secure the head, the fastener is actually being “twisted” while it’s being torqued to the proper reading. Accordingly, the bolt is reacting to two different forces simultaneously. A stud should be installed in a “relaxed” mode – never crank it in tightly using a jammed nut. If everything is right, the stud should be installed hand tight. Then, when applying torque to the nut, the stud will stretch only on the vertical axis. Remember, an undercut shorter stud will have a rate similar to a longer, standard shank stud. This provides a more even clamping force on the head. Because the head gasket may compress, check with your gasket manufacturer to see if retorquing is required. HEAD BOLTS