Mazworx SR20 ARP2000 Head Studs Kit for Silvia 240sx S13 S14 S15 SR20DE SR20DET. Will not fit GTiR Note: Will not fit GTiR Car Make: Nissan / Infiniti Car Model: Silvia 240sx 180SX s13 s14 s15 / Sentra Years: 89-99 Engine: SR20DET SR20VE SR20VET SR20DE Material: ARP2000. Mazworx SR20 ARP2000 Head Studs Kit for Nissan Silvia 180SX 240sx S13 S14 S15 SR20DE SR20DET SR20VE SR20VET Upgrading your stock head bolts is a necessity when building an upgraded motor. Here are the Mazworx SR20 head studs kit. These are the correct length that will completely bottom out and provide extra clamping force needed. ARP2000 is capable of achieving clamp loads in the 215,000-220,000 psi range. ARP2000 is used widely in short track and drag racing as an up-grade from 8740 chrome moly in both steel and aluminum rods. Stress corrosion and hydrogen embrittlement are typically not a problem, providing care is taken during installation. Made from ARP2000 material. Straight shank/bullet ends from the complete bottom out. Please message us for a Return Authorization Number before sending anything back to avoid processing delays. Real Street Performance is unlike most “Race Shops”. We are a fully functioning wholesale and retail distribution warehouse in addition to a dyno-equipped tuning and engine building facility. Our sales center and order fulfillment center operates with state of the art, industry leading software that allows us to get you ALL of the parts you need for your build quickly and correctly the first time without the headaches or excuses. Sign up to our Newsletter.