The 308 GT4 V-8 had a 90-degree, dual-overhead-camshaft, 2927 cc motor with 4 Weber carburetors which produced 250 hp (186 kW). The V-8 block and heads were made of an aluminum alloy. The compression ratio was 8.8:1. The American version had a timing change and an air-pump; it produced a modest 230 hp (172 kW). The GT4 weighed 2535 pounds.