The 305 was modified to be used in the G-Body Hurst/Olds and 442 models, and, given the times, developed more respectible horsepower and performance. The small block was later expanded to 403 cubic inches and also "de-bored" to both 260 and 305 cubic inches in response to tightening EPA mileage demands and smaller body styles. In 1968, the engine was enlarged to 350 cubic inches and again used in 2-barrel and 4-barrel form from that year until it was discontinued in the early 80's.
#Diesel v8 big cam 350 full size#
The horsepower and torque of the 330 allowed for the engine to be installed in the full-sized Jetstars as the base engine, In 4-barrel form, it would be the upscale powerplant for both mid and full size Oldsmobiles. It was also to be used as the workhorse for the entry-level full sized vehicles. The engine was no longer aluminum, but cast iron, as weight became less of a factor with the engine going into both the larger mid-sized F-85s and Cutlasses as well as the full-size Jetstar 88s introduced in that year. The 330 V-8 shared none of its engine block architecture with that of the 215 V-8 and the 225 V-6 sourced from Buick.
In 1964 Olds replaced their small block 215 V8 with a cast iron block of completely new design. It was the only GM engine to meet US emission standards using a carburetor - all the way up to 1990, when it was finally retired.Īll Oldsmobile engines used hydraulic lifters, including the high performance versions. This very open and flat chamber was fuel efficient and had lower than average emissions output. This was much flatter than the 23 degree head of the small-block Chevrolet and 20 degree head of the Ford small-block wedge.
Generation 2 engines, while being a wedge-head design, had a unique combustion chamber that resulted from a valve angle of only 6 degrees.
All generation-2 small-block Olds V8s used a stroke of 3.385 " however, the big-block used either a 3.985" (1965-1967) or a 4.25" stroke (1968- 1977). Big-block and Diesel versions also used a larger 3.0" main bearing journal instead of the 2.5" mains of the small block. All Oldsmobile small and big blocks used the same critical dimensions, using the same bore centers, although "big-block" versions were produced with a 10.625" deck height rather than the 9.33"height of the small block.
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