Each stud is precisely heat-treated to 190,000 psi. Following heat-treat, each stud is centerless ground to make it as close to perfectly concentric as possible. This procedure results in an exceptionally straight part. Machining the part after heat treating it is difficult and costly because the alloy steel is much harder, but provides a very consistent and reliable part. We stock a wide range of performance and tuning parts for the Silvia, including forged pistons, uprated rods, uprated multi layer steel head gaskets too- both stock thickness and thicker ones to reduce the compression ratio if you are not lowering the comp ratio by other means- check out our store. Check out our large and rapidly expanding range of items for the Silvia- consumeables, performance upgrades, tuning items. P.
