The Toyota 4AG 20V is one of the most iconic small displacement engines ever made—rev-happy, unique with its Yamaha 5-valve head, and the heart of the legendary AE86. But as much as we love it, the 4AG has its flaws: weak cranks, block integrity issues, valve train limitations, and poor ROI for power.
In this build, we take on the challenge of creating the ultimate naturally aspirated 4AG 20V stroker using modern tech and engineering solutions. The goal? Broad torque, durability at 9,500 RPM, and fixing all the old weaknesses of the 4AG platform.
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