OS Giken Releases L Series Head

4:02:00 PM


In the early 1960's, Osamu Okazaki wanted to build a true high-performance Japanese race car to compete against the sports cars from Europe that were dominating the sport at the time. Like many hot rodders before him, he started working in his garage, figured out how things worked, and designed improvements to increase performance.



A self-educated man, he originally began working on motorcycles and later cars. Mr. Okazaki founded his company, OS Giken, in the early 1970's with strength, durability, and the pursuit of high performance in mind. He only wanted to put his name on the best products and one of his most sought after creations was the TC16-MA2 and TC24-B1 twin cam heads for Datsun L-series engine.


The head was designed in 1974 and successfully campaigned on the international rally and circuit racing scene; if you had one on the streets of Japan your car was virtually untouchable. Producing 230+hp naturally aspirated out of a 4-cylinder engine.  The 6-cylinder version (TC24-B1) followed shortly thereafter, with a specific target of outperforming the fastest production car of the time, the Porsche 930 turbo. Featuring twin cams, pent-roof combustion chambers, and 24-valves, producing nearly 320+hp the head effectively doubled the horsepower of the L series engine. Collectors and vintage racers have long prized original OS Giken heads, fewer than ten of some models were even known to still be in existence.


So image my surprise when I saw a 240Z Motor topped with a OS Giken head at the 2013 SEMA show. The engine is pure artwork and while we would love to pick up one for our project 240Z, however, the price is astronomical. The representative said that the head, timing gears, cams, valve cover and intake manifolds will set you back a staggering $32,000 USD, that price does not include the carbs, short block or exhaust header, or the super cool carbon fiber velocity stacks. While we love the idea of picking up a OS Giken head from the speed shop putting a $32,000 head into a car we just paid $1,200 for does not seem like it would be a wise investment. According to the guys at the SEMA show they have already sold 8 heads on back order and will be shipping in early 2014. For more visit osgiken.net


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