The plan was revised and two 1969 Dodge Polaras were to be retrofitted with steam engines for testing. One car was to be modified by Don Johnson of Thermodynamic Systems Inc. and the other by industrialist William P Lear's Lear Motors Incorporated. At the time, the California State Legislature was introducing strict pollution control regulations for automobiles and the Chair of the Assembly Transportation Committee, John Francis Foran, was supportive of the idea.