Though hot rodders like performance, there are other constraints to consider when installing an engine. Both weight and physical size are two other points to consider, so STREET RODDER decided to illustrate the physical size difference between three engines: the 4.6 Ford, the 351W Ford, and the 350 Chevrolet. For this comparison, the height is measured from the bottom of the oil pan to the air filters mounting surface. The width is measured from the outside edge of each valve cover, and the length is from the face of the bellhousing to the water pump pulley. All measurements are approximate.