Far superior to any other main bolt kit offered for use in competition engines, ARP main bolts are designed to meet the exacting standards and demands of professional engine builders. Forged from 8740 chrome moly, all bolts feature generous under-head radius and rolled threads for the utmost reliability. The threads are rolled after heat-treating, which makes them about 1000% longer fatigue life than most main bolts, which are threaded prior to heat-treating. Available in the popular High Performance Series, which at a nominal rating of 180,000 psi, is a premium replacement for OEM fasteners, or the 200,000 psi nominal rated Pro Series , application-specific main bolts with reduced wrenching head and are designed for use in competition applications. Parallel-ground, hardened washers are included with each kit
Arp Offers A Special Version O f Its Rugged Balancer 200,000 Psi Rated Balancer Bolt That C an Accept Standard 1/2 Drive R atchet Or Breaker Bar To Facil itate Rotation Of The Crank As sembly.
* 1/2 Square D rive Forged Into Bolt Head, En abling The Rotation Of An Engi ne With Any 1/2 Drive Tool
* Made From Heat-treated 8740 Chrome Moly Steel With He avy-duty Black Oxide Finish
Prevent Intake Manifold Leaks With Arp's Quality Fateners. T hey Are Rated At 170,000 Psi A nd Precision Machined For Opti mum Thread Engagement. Wide Un derhead Flange And Companion W ashes Provide Even Load Distri bution. Precision Rolled Threa ds Prevent Galling While Promo ting More Consistent Torque Lo ading. Facilitates Optimum Sea ling Of Gasket Surfaces. Washe rs Included.
It Is For Good Reason That Vir tually Every Top Professional Engine Builder Relies On Arp P ro Series Head Studs For Their All-out Competition Powerplan ts. Simply Stated, There's Not A Better Stud Set Up On The M arket Today. For Openers, Arp Uses A Premium Grade 8740 Allo y That Is Rated Far Superior T o Aircraft Quality. Then Each Stud Is Placed Vertically In S pecial Racks And Precisely Hea t Treated To 200,000 Psi. This Procedure Ensures Complete He at Penetration And The Results Are Far Superior To Those Les ser Quality Studs From Other M anufacturers Who Just Dump Pie ces In A Basket And Hope For T he Best. You Will Also Note Th at Arp Offers Specially Underc ut Studs For Several Engines. This Procedure (done Only To T he Shorter Studs) More Equaliz es The Stretch Of Both Studs, Which Makes For A More Consist ent Clamping Force - And One T hat Compensates For Head Gaske t Compression When The Cylinde rs Are Installed. This Helps P revent Blown Head Gaskets, And Assures Optimum Sealing! Arp Head Stud Kits Are Available W ith Your Choice Of Conventiona l Hex Nuts Or Compact 12-point Nuts. Premium Quality Ground