Another odd looking gasoline head that, according to what we just told you could be mistaken for a diesel head, is actually from a first generation Chevrolet big-block or a W-series engine (with displacements of 348ci, 409ci, and 427ci—yes, the legendary 409 of the Beach Boy’s song about hot rods). Notice how the head lacks a dished-in combustion chamber? Unlike most gasoline engines, past and present, the W-series combustion chamber was located in the top of the cylinder and not the head. The block was decked so the head sat at an angle relative to the top of the piston. This created a wedge-shaped combustion chamber that helped build plenty of low-end torque, helping create the legend of these motors in drag racing or propelling old Chevy trucks around.