If the survivability of your camshaft drive, through an entire race without stripping or breaking, has been a matter of concern ARP's new cam drive should put your mind to rest. We built this setup to be bulletproof. Totally reliable. A through-hardened, not just case hardened, chrome moly shaft, premium grade Viton seal, plus anodized aluminum plate are manufactured in-house to insure that every part is guaranteed ARP quality. The perfect compliment to our bulletproof cam drives are these precision seal plates. They're made of CNC-machined 7075-T4 alloy aluminum and anodized to resist corrosion. Available in 2.100 and 2.380 diameters to fit most any OEM or aftermarket block. Features Drive forged ARP2000, 220,000 psi alloy chrome moly steel with corrosion-resistant oxide finish. Concentricity .001 T.I.R., between shaft and hex, 1 and 1.5 length Threads form rolled 9/16 x .625 on cam end, 3/8 hex on drive Seal Plate CNCmachined 7075-T4 aluminum with Viton seal Cam Drive Size 1.5in