ARP 12-Point Engine Fastener Kit / EVO Big Twin

ARP 12-point engine hardware for the Evolution big twin, built to Feuling's spec and rated well past what came out of the factory.

Evo engine bolts live a hard life: heat cycles, vibration and, on the outside of the motor, twenty five years of weather. Stock and chromed replacements give up in predictable ways, galling in the threads or losing clamp load until a cover starts to seep. ARP makes these from 8740 chrome moly, heat treated and rated at 170,000 psi tensile, with threads rolled instead of cut so they engage fully and torque consistently. The wide flange under each head spreads the clamp load across the surface, which is the part that actually keeps a gasket sealed.

Features of the ARP 12-Point Engine Fastener Kit

• 12-point heads for socket access on tight engine fasteners
• Heat treated 8740 chrome moly steel with a black oxide finish
• Precision rolled threads for full engagement, to prevent galling and give consistent torque loading
• Wide underhead flange spreads load evenly for better sealing and fewer leaks
• Tensile strength rated at 170,000 psi by ARP, above OEM and above grade 8
• Moly assembly lubricant included
• Manufactured by ARP to Feuling's exact specifications
• Made in the U.S.A.

What Is in the Kit

This is the external engine kit. It covers the fasteners around the outside of the motor and the mounts: front engine mount, front case mount, rear engine to transmission mount, oil filter adapter mount, upper oil pump, cam cover, case nuts, and rocker covers with sealing washers.

ARP 12-Point Engine Fastener Kit Fitment

• '85-'99 Harley-Davidson Evolution big twin

Common Questions About the ARP Evo Kit

Does this include the rocker box housing bolts?
No. This kit covers the fasteners around the outside of the motor and the engine mounts. The separate rocker housing kit is no longer available.

Do I torque these to the factory figures?
Use the service manual values with the supplied moly lubricant applied. Moly changes thread friction, and a torque figure only means something with the lubricant it was written for.

Why not chrome hardware?
Chrome plating adds thickness to the threads and is the usual source of galling and inconsistent torque on an Evo. ARP's finishes are applied without that penalty.

Works With

Building an FXR? Finish the rest of the bike with the ARP 12-Point Chassis and Trim Kit for FXR, which covers the same years from the frame out.