Several modifications were made to the Pantera for the 1972 model year. A new four-bolt main Cleveland Engine, was used with lower compression ratio (from 11:1 to 8.6:1, chiefly to meet US emissions standards and run on lower octane standard fuel) but with the more aggressive "Cobra Jet" camshaft (featuring the same lift and duration as the 428 Cobra Jet's factory performance cam) in an effort to reclaim some of the power lost through the reduction in compression ratio along with a dual point distributor. Many other engine changes were made, including the use of a factory exhaust header.