three two-barrel carburetors with a sequential linkage (replacing the previous dual-quad set-up). Power ratings increased accordingly: (with manual transmission) Two-barrel carburetor, 8.5:1 compression, @ 4600 rpm, @ 2300 rpm Four-barrel carburetor, 10:1 compression, @ 4800 rpm, @ 2600 rpm (with Hydramatic) Two-barrel carburetor, 10.0:1 compression, @ 4800 rpm, @ 2600 rpm Four-barrel carburetor, 10.25:1 compression, @ 4800 rpm, @ 2900 rpm Three two-barrel carburetors, 10.75:1 compression, @ 5000 rpm, @ 2800 rpm. Several dealer-installed camshafts were optional to increase power further to . which was seen on the hood of the 1957 Daytona Grand National winning car driven by Cotton Owens. Standard only for the Pontiac Bonneville was Pontiac's first-ever fuel injection system. A mechanical system built by Rochester, it was similar in principle, but not identical, to the contemporary Chevrolet "fuelie". Pontiac did not release official power ratings for this engine, saying only that it had more than . Contemporary road tests suggest that it was actually somewhat inferior to the Tri-Power engines, although it did have better fuel economy. Only 630 Bonnevilles were produced for 1957, all of them fuel-injected. 370 For 1958 the V8's bore was increased again to , increasing displacement to . The engine was dubbed the TEMPEST V-8, a nickname it retained until the end of 1960. The fuel-injected engine became an option on any Pontiac model, carrying a staggering price tag of $500 (almost 15% of the car's base price). It was rated at @ 4800 rpm and @ 3,000 rpm on 10.5:1 compression. Only about 400 were produced before the fuel injection system was quietly dropped. 389 For 1959 the V8's stroke was increased to , raising displacement to . This was the beginning of factory supplied performance items such as 4 bolt main bearings and windage trays to reduce friction from crankcase oil. The 389 would remain the standard Pontiac V8 engine through 1966, offered in a bewildering variety of outputs ranging from . The 389 was the standard engine for the Pontiac Grand Prix and Pontiac Bonneville and installed in the Pontiac GTO through 1966. Beginning in 1961 the Pontiac V-8 (389 and 421) was dubbed the Trophy V-8, due to its many victories in racing. Trophy 4 Perhaps the most unusual variation of the Pontiac V8 was the 1961-63 Trophy 4, which was a 45-degree inclined inline-4 created from the right bank of the 389 for the debut of