Cylinder Head Studs for Triumph/Spitfire 1.3L & 1.5L Spitfire 12-pt Nuts

Cylinder Head Studs for Triumph/Spitfire 1.3L & 1.5L Spitfire 12-pt NutsIt is for good reason that virtually every top professional enginebuilder relies on ARP Pro Series head studs for their all out competitionpowerplants. Simply stated, theres not a better stud setupon the market today. For openers, ARP only uses premium grade 8740 alloy anda proprietary ARP2000 alloy that are rated far superior to aircraftquality alloy steels. Secondly, each stud is placed verticallyinto special racks and precisely heat treated to

All of them are substantially better than the stock OEM and most aftermarket bolts

This is a premium steel that is processed to deliver superior strength and fatigue properties

You’ll note that the studs have a radiused bullet nose that serves to locate the pan rails

Studs are manufactured with a unique nut-starter nose that helps prevent cross-threading

Precision rolled threads prevent galling while promoting more consistent torque loading

or use the chart on page 25 of thiscatalog for ARP fasteners

originally developed for NASCAR competition

12-point head design and larger than stock shank diameter for increased strength and improved flywheel register

Far superior to any other main bolts available for use in competition engines

hard-to-reach coils)

Complete with washers

Our kits come in 8470 or polished ARP Stainless and cover spacers up to 3