engine was further modified with dual overhead camshafts (though still two valves per cylinder) and a two-stage supercharger. This combination gave the car better top-end performance and the resulting gave it five Grand Prix wins. Development continued the following year, but the problematic superchargers were dropped in favor of larger displacement and Lampredi's 275 engine superseded the original Colombo design. Applications: 1947 Ferrari 125 S — 1948 Ferrari 125 F1 — Single supercharger, 1949–1950 Ferrari 125 F1 — Dual-stage supercharger, 58.8 mm stroke The early 166, 195, and 212 cars used Colombo V12s of varying sizes. All shared the same stroke, with 60, 65, and bores giving displacements of in the 166, in the 195 and in the 212, respectively. Output ranged from to . 250 One of the most common Colombo engines is the 250, which debuted in 1952 in the 250S and lasted through the 1963 330 America. It used a bore with the common Colombo stroke of for a total of . Beginning with the famous 250 TR, "Testa Rossa" racing car, Ferrari began a new series of modifications to the Colombo 250 engine. The spark plugs were moved to the outside of the cylinder head, near the exhausts. This enabled Ferrari to introduce separate individual intake ports to use with the six two barrel Weber carburetors. Four cylinder head bolts per cylinder were introduced (instead of three) to cope with the added power. These changes eventually were incorporated into the Ferrari road cars, beginning with the 250 GT SWB and the 250 GT Series II Pininfarina cars. 275 The final Colombo Ferrari was the 275. It used a variant of the V12 with a wide bore for up to . 330 The 1960 400 Superamerica replaced the previous model's Lampredi engine with a Colombo. It diverged from the standard stroke with a stroke and bore. Output was with triple Weber carburetors. Although the 1963 330 series also used a engine with the same bore and stroke as the 400 Superamerica, this engine was quite different. It used a wider bore spacing, paving the way for future displacement increases. The spark plugs were moved and a new water pump was used. The dynamo on the prior versions was replaced by an alternator. 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