12-Pt Head Stainless Intake Manifold Bolts for AMC 290-343-390 cid, uses 3/8˝ socket

12-Pt Head Stainless Intake Manifold Bolts for AMC 290-343-390 cid, uses 3/8˝ socketPrevent intake manifold leaks with ARPs quality fasteners. Theyre nominally rated at 180,000 psi and precision machined for optimum thread engagement. Wide underhead flange and companion washers provide even load distribution. Precision rolled threads prevent galling while promoting more consistent torque loading. Facilitates optimum sealing of gasket surfaces. Available in choice of black oxide finish chrome moly or corrosion resistant stainless

including the elimination of main cap walk and fretting

Material 2: 8740 Chrome Moly

rated at 190

A premium grade 8740 alloy chrome moly steel is used to manufacture ARP High Performance connecting rod bolts

which gives themabout 2000% (that’s twenty times) better fatigue strength thanthose studs that are threaded prior to heat-treat (a very commonindustry practice)

and is capable of more than 12

Following heat-treat

Kits come with hardened parallel-ground washers

A true high performance washer from ARP

Both are available in black oxide finished chrome moly steel or polished ARP Stainless

All Pro Series head bolts have areduced wrenching hex or 12-point head and wide area flange to permit the use of larger diameter valve springs and eliminate theneed for valve train removal during cylinder head retorquing

and the favoriteof leading professional engine builders in all forms of racing