The choice of many top professional engine builders for their all-out competition powerplants Manufactured from a premium grade 8740 alloy that is heat-treated to 200,000 psi, which is considerably stronger than Grade 8 hardware ARP 235-4702 Big Block Chevy Brodix heads with 12 Point nuts. ARP 235-4702 ... ARP 134-3601, Small block Chevy Head Bolts. ARP 134-3601. Our Price: $89.99... Then the studs are centerless ground to make them as close to perfectly concentric as possible, unlike lesser quality studs. ARP uses a premium grade 8740 alloy, which is rated far superior to aircraft quality, for their Pro Series cylinder head studs. ARP INC. 256-4002 FORD MODULAR 4.6/5.4L 3-VALVE HEX HEAD STUD KIT 235-4302. BB Chevy Brodix 12pt head stud kit. Cylinder HeadHead. Installation Instructions. Download Instructions. Applications. Chevrolet - Big Block - Brodix By being thread rolled after heat-treat, these studs have about 1000% (that's ten times) better fatigue strength than those studs that are threaded prior to heat-treat (a very common industry practice). It costs a lot more to do it this way, because it's tough on tooling, but the results are well worth the extra effort. Kit comes complete with premium quality parallel ground washers and compact 12-point style nuts Cylinder Head Studs Arp Ford Head Stud Kit - 6.9L International Diese With 12 Point Nuts Centerless ground to be as perfectly concentric as possible
