"Granted this is not the first time we have looked at the OS Giken’s TC24-B1Z, but seeing it’s further been refined from last year’s Nostalgic 2 Days show, I thought I’d dedicate a little post to it as it’s simply, a work of art. It was back in the late seventies that Okazaki-san from OS Giken decided to convert what was then one of Nissan’s most popular engines, into a true high performance powerplant. High power and high rpm were two of the main goals for the project, which was all based around an aluminum twin-cam head design. Combined with a reworked bottom end of their choosing, customers would really tap into the true potential of the L-series. Only 11 OS Giken TC24-B1 heads were created, demand was low due to the high cost but it was quickly regarded as the ultimate modification for Nissan’s popular straight six." (Text/Photo by Speedhunters @thespeedhunters) FULL FEATURE @ Speedhunters.com/2013/02/engine-porn-os-giken-tc24-b1z/)