There is a saying in the performance business; “Bigger is always better, and too much is just enough”. Apparently, Chevrolet discovered this early in their performance career, constantly installing larger, more powerful engines with each passing year. And 1966 would usher in the dominance of the Big Block Chevy Engine! The L72 engine was the forerunner of the L88, 427. And in reality there were a limited number of “engineering use only” test subjects that were produced in 1966; Three to be exact. These three engines were distributed to race teams known to assist Chevrolet with proving new designs; one of which was Roger Penske, the other two were NASCAR teams. Peter Fonda (yes, Easy Rider, Peter Fonda) found himself on the receiving end of one of these “test” engines. His car equipped with a 2.36:1 differential! Although not an official offering, Mr. Fonda wanted to set a Land Speed Record at Bonneville.