7/16-20 x 3.250 12pt black oxide bolts

7/16-20 x 3.250 12pt black oxide boltsMaterial: 8740 Chrome Moly Finish: Black Material 2: Finish 2: Origin: USA

They’re forged from premium grade 8740 chrome moly steel and are heat-treated to a nominal rating of 190

with threads rolled after heat treat to ensure the optimum fatigue strength

Many professional engine builders prefer to use studs because of their ability to properly position the gasket and guide the cover into position

Specially drilled “NASCAR” models are available for those who wish to safety wire their header bolts to prevent loosening

Pro Series main bolts are application-specific

and meet theARP “ZERO defect – ZERO failure” quality standard

You won’t find abetter quality stud on the market from any other source

Most applications have undercut short bolts that can help eliminate head gasket failures through providing more “stretch” to compensate for theadditional compression of gaskets

Lengths are exact – designed to provide positive seating every time

Available in a variety of sizes to suit your needs

they’ve been known to break at the most inopportune time

Best of all it is less expensive and expected to soon replace MP-35 as the material of choice in the high strength