The second generation launched February 26, 1970. Popular belief blames a strike; the documented cause was Fisher Body tooling trouble with the complex new rear quarter-panel dies — a 4–5 month delay that pushed the launch out of the normal fall window.
The Z28 got the LT-1 350, borrowed from the Corvette after SCCA raised its displacement ceiling. No convertible was offered this generation (the drop-top returned in 1987).