The keyword exploded due to three specific builds:
Standard valvetrains fail above 9,000 RPM due to valve float. The Ambition FEDV 343 Top utilizes: rei amami ambition fedv 343 top
The "FED" stands for Fuel Efficient Dynamic, a fictional designation for a hybrid block derived from the legendary 4G63 (Mitsubishi) and the newer 4B11T. Amami famously took the closed-deck stability of the 4G63 and mated it with the lightweight, high-revving architecture of the 4B11. The keyword exploded due to three specific builds: