Ferrari Colombo Engine - Four-cam

Four-cam

The Colombo V12 was substantially reworked for 1967's 275 GTB/4. It still used two valves per cylinder, but dual overhead cams were now used as well. In a departure from previous Ferrari designs, the valve angle was reduced three degrees to 54° for a more-compact head. The dual camshafts also allowed the valves to be aligned "correctly" (perpendicular to the camshaft) instead of offset as in SOHC Ferraris. It was a dry-sump design with a huge 17 qt (16 L) capacity. The engine retained the bore and stroke dimensions of the 275 model for 3286 cc of displacement. Output was 330 hp (246 kW) at 8000 rpm and 240 lb·ft (325 Nm) at 6000 rpm with six Weber 40 DCN 9 carburetors.