machined into the cam bores. A single drilled passage per bearing saddle feeds both cam and crank journals. Shared with the Oldsmobile Rocket V8 is how the lifters are supplied oil through small 'bleeds' instead of placing the lifters directly into the right and left side oil supply galleries. Many early racers would replace the Cadillac hydraulic lifter and rocker assemblies with the solid lifters and adjustable rockers from the Studebaker V8 for operation at higher engine speeds. 365 Displacement was increased to for 1956 by increasing the bore to while maintaining the stroke. For the 3 years that the 365 was made, the base versions had a single 4 barrel carburetor. The 1956 version produced 285 horsepower. The 1957 version raised that base engine output to 300 horsepower, while the 1958 base version cranked out 310. Eldorados featured multi-carb engines in all 3 years. The Eldorado engines were optional on all other Cadillacs too. The 1958 Eldorado 3-2bbl version produced . 390 A longer, stroke pushed displacement to for 1959, yielding , while the Eldorado Tri-power reached . 390 series For the 1963 model year Cadillac redesigned its V8 engine, modernizing the tooling used in the production line while optimizing the engine's design. Although it shared the same layout and architecture with the 1949-vintage engine, the revised engine had shorter connecting rods and was lower, narrower, and shorter. The accessories (water pump, power steering pump, distributor) mounted on a die-cast aluminum housing at the front of the engine for improved accessibility. An alternator replaced the former generator. The crankshaft was cored out to make it both lighter and stronger. The revised engine was lighter than its predecessor, for a total dry weight of . The revised engine shared the same bore and stroke of its predecessor, for an unchanged displacement of . Power was unchanged at , as was torque at . 429 For 1964 the engine had a bore and stroke, raising displacement to . Power rose to and torque to . It also included its first emission control system, a positive crankcase ventilation unit was installed beginning in the 1964 model year. The 429 was used through the 1967 model year. (It is not uncommon to find an early 1964 model year with the '63 390 V8 as Cadillac tried to use up the older engines in stock.) 472 series Cadillac introduced an all-new engine for 1968.