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4.6 Liter
This is a stock style setup for the 4.6L modular engine, featuring the stock 3.550" stroke. Whether  intended for stock replacement or racing, various levels of compression will allow for improved performance with emphasis on top-end power and high RPM. Pick a low compression kit and they are excellent when paired with a supercharger or turbo!
5.1 Liter
This is a Ford Modular 4.6L based stroker setup using a 3.750" stroke to achieve a displacement of 5.0/5.1 liters. With great balance between top and bottom end power, they are ideal for many applications. Various levels of compression make these great for all types of setups - naturally aspirated or boosted (supercharged, turbocharged). Bore sizes range between 3.552" (5.0L) and 3.625" (5.1L).