283 bhp (211 kW) 283 cu in (4.64 L) Small-Block engine . [ 7 ] Other options included power windows (1956), hydraulically operated power convertible top (1956), four speed manual transmission (late 1957), and heavy duty brakes and suspension (1957). [ 7 ] 1960 Corvette Convertible The 1958 Corvette received a body and interior freshening including