ARP Main Stud Kit for B18C1 B18C5 (Integra GS-R/Type R)

ARP Main Stud Kit for Acura Integra B18C1 B18C5 - Part #208-5403

A B18C that lives at 8,000 rpm or takes boost on the stock sleeves puts real load into the main caps, and cap walk is how a healthy GS-R bottom end turns into spun bearings. The ARP main stud kit for the B18C1 and B18C5 replaces the factory main bolts with studs on any 1994-2001 Integra GS-R or Type R build, or any B18C swap.

What It Is and Why It Works

Studs beat bolts on the mains for the same reason they do on the head. A stud sits hand tight in the block and stretches on one axis as the nut is torqued, so the clamp load is more accurate and more consistent across all five caps. The block threads see less stress because nothing twists in them, which matters on an aluminum Honda block you plan to keep through more than one refresh. Studs also locate the caps more positively, which helps bearing crush and alignment on a high rpm B18C. ARP machines these from 8740 chromoly heat treated to 200,000 psi with threads rolled after heat treat, and the kit includes all 10 studs, 12-point nuts, hardened washers, and assembly lubricant for the 2-bolt main B-series block.

Specs

Fitment

US market Integra Type R years are 1997, 1998, 2000, and 2001. This kit also covers B18C swaps into EG, EK, and other chassis, since the fitment follows the engine.

What to Know Before You Buy

This is a machine shop part, not a driveway bolt-on. ARP notes an align hone of the main bores may be necessary after installation, because the studs clamp the caps harder than the factory bolts and can pull the bores slightly out of round. The right move is to install the studs, torque the caps, and have the shop verify main bore size and alignment while the block is bare. Do not pull the pan on an assembled engine and swap studs in for peace of mind, you can create a bearing problem you didn't have. Order these when you're doing the bottom end properly: bearings, measurement, and hone. The GS-R's B18C1 and the Type R's B18C5 both use this kit, and it pairs naturally with ARP rod bolts (208-6401) and head studs in a full build.