With just 57 units produced, the rare Z11 V8 is the rarest Chevrolet engine ever and remains valuable today. The Z11 V8 was a powerful drag racing engine based on enhancements made to the 409 ci ...

These new V8 engines used a block that was larger ... super high-performance versions produced for 1963 (listed as RPO Z11, at a cost of $1,240), which carried a manufacturer's rating of 430 ...

Most customers – 735,900 – ordered a V8 engine on their Impala ... but the 1963 Impala could also be ordered with a 427ci unit with a Z11 drag treatment. The $1,245 upgrade included massive ...