Because of frictional inconsistencies with oil, moly, and other lubricants it takes multiple cycles of torquing the bolt, loosening it, and tightening it again to obtain the required preload or stretch. Typically, when a fastener is first tightened, friction is at its highest point and the preload value or stretch is low. As the fastener is cycled numerous times the friction decreases and the preload increases. This phenomenon is called "preload scatter." With ARP Ultra Torque assembly lubricant, a fastener need only be torqued once to get within 5 percent of ideal preload, and it remains consistent through all subsequent cycles (from race-prep machining through final assembly). Moreover, given the inconsistencies of ordinary lubes, it is quite possible for adjacent head bolts or studs to have vastly different preloads. This scatter causes bore distortion, hampers piston ring seal, and leads to poor head gasket sealing.

More From This Category

COMP Cams Rocker Arm, Ultra Pro Magnum, Full Roller, Chromoly Steel, 1.6 Ratio, For Chevrolet V6 and SBC 3/8 in. Stud, Each

COMP Cams Rocker Arm, Ultra Pro Magnum, Full Roller, Chromoly Steel, 1.6 Ratio, For Chevrolet V6 and SBC 3/8 in. Stud, Each

$65.07

6Boost Exhaust Manifold, Izusu G180, T3/Nil 'Open Entry' to suit IWG

6Boost Exhaust Manifold, Izusu G180, T3/Nil 'Open Entry' to suit IWG

$1,100.00

QA1 Front Sway Bar, 71-76 GM B-Body

QA1 Front Sway Bar, 71-76 GM B-Body

$808.58

Whiteline Front Control Arm, Upper Inner, Rear Bushing, 46.6mm and 45.6mm OD, 28mm ID, Toyota, Kit

Whiteline Front Control Arm, Upper Inner, Rear Bushing, 46.6mm and 45.6mm OD, 28mm ID, Toyota, Kit

$117.96

Dakota Digital Gauge, MDX System, 1955-56 Chevy Car, Black Alloy Style Face, Blue Display, Custom

Dakota Digital Gauge, MDX System, 1955-56 Chevy Car, Black Alloy Style Face, Blue Display, Custom

$1,968.40