A motorcycle frame is provided which enables a conventional automobile engine block to be secured thereto while also eliminating all counterproductive torque generated by the engine block. The frame includes a housing having a pair of subframes of essentially quadrilateral configuration extending parallel to the longitudinal axis of the motorcycle. Each subframe comprises a pair of tubes which may be disconnected for access to the engine blocks. Each subframe is formed by a pair of upper and lower tubes. The subframes are connected at one end to a steering head and angle outwardly approximately one quarter of the length of the subframes with the remaining length extending parallel to the longitudinal axis of the motorcycle. Generally semicircular shaped tubular members are provided for securing each of the subframe upper tubes to the lower tubes to provide reinforcement for the subframes. A plurality of engine block mounts are provided along the inner periphery of the housing for securing the engine block parallel to the centerline of the motorcycle. Additionally, a plurality of support braces are provided for supporting the engine block within the housing.