The McLaren M6A was the first monocoque chassis constructed by the team, following the M1A and M1B which used a tubular spaceframe chassis. The M6A was designed to race in the 1967 Can-Am season and netting success, with the teams first of many Can-Am championships. The M6B was the version of the M6A that was available to buy as a customer car ready for racing in the Can-AM series and others.
The McLaren M6B's were nearly identical to the M6A, only sold to customers without an engine so they could use their choice of engine. The bodywork of the car was designed with aerodynamics in mind to increase downforce and it's performance capabilities.