Origin Iso Grifo



iso grifo series i, rear view


iso s.p.a. in bresso known producing high performance iso rivolta ir 300; sleek looking 2+2 coupe based on chevrolet corvette power , drive train. after leaving ferrari, in 1961 giotto bizzarrini set “prototipi bizzarrini” in livorno, tuscany designed , consulted marques ats, lamborghini , iso. in 1963, designed iso grifo a3/l (l lusso {italian luxury}) renzo rivolta, looking follow-up iso rivolta ir 300. body designed giorgetto giugiaro @ bertone, while bizzarrini put expertise in mechanicals. bizzarrini figured there demand race version of grifo , came a3/c (c corsa) dramatic modified alloy body. later dubbed “improved gto , had been designer 250 gto when had worked ferrari. engine moved 4 decimetres (16 in), making a3/c front-mid-engined car. adjust timing piece of dash removed. both cars being built simultaneously. when leaving factory both 250 gto , iso grifo fitted pirelli cinturato 205vr15 tires (cn72).


that same year bertone showed grifo a3/l prototype @ turin auto show, while iso showed off (partly unfinished) competition version; iso grifo a3/c. both overwhelmingly successful. although design changes had made prototype, iso concentrated on getting grifo a3/l ready production. car got light face-lift made less aggressive in appearance. “street” iso grifo gl received fast, modified reliable chevrolet small-block 327 corvette engine v8 (5.4 l) engine—either in 300 or 350 hp—coupled borg-warner 4-speed top-loader. engines ordered , manufactured in united states, taken apart , blueprinted before installed in cars, done iso rivolta ir 300 before. on 400 horsepower (300 kw) , weight of less 2,200 pounds (1,000 kg), vehicle able reach speeds on 275 km/h (171 mph).


while renzo rivolta focused on a3/l; giotto tried promote a3/c—making tension between two. meant grifo gl being produced @ bresso , a3/c @ piero drogo’s sports cars of modena under giotto’s strict supervision. in 1964, prototype grifo a3/c raced @ le mans (edgar berney/pierre noblet), running until brake problems required two-hour pit stop. car resumed race, finishing in 14th place; encouraging result brand-new car. 22 examples of bizzarrini grifo a3/c constructed before disagreement between renzo , bizzarrini ended cooperation.








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