[copo-2]

1963 would be the last year for factory backing in the field of racing? For a final effort, Chevrolet Motor Division would go out on a limb in building at least 50 special lightweight Impalas with a larger 427 engine. This special built option was called Z-11 at an additional cost of $1240.00 with a curb weight of about 3,400 lbs. according to a little research? The 427 motor developed for the Z-11 was initially rated at 430hp, however, some competitors were believed to have gotten over 500hp with the help of installing of headers?

Dick Harrell was one of those with access to a Z-11 that proved well for him winning the AHRA Winter Nationals. He later set a record speed for his class at 118.57 mph.

Harrell was faced in 1964 without factory backing, as were other’s such as Jenkins, by engineering their own method to compete against other corporate engineers? Both of these men would find ways to successfully compete against Ford & Mopar?

Dick Harrell would retain the 427 W block to compete in a 64 Chevelle to compete against the newly introduced mid-sized Ford Thunderbolt. Then, the 427 W Z-11 engine was put in place in
“Retribution 11” with fuel injection.