Reference Manual

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Chapter 1: Engines: Oldsmobile V8s: 307

The 307 was built from 1980 through 1990, produced from 140hp to 180hp, and was installed in just about every car Oldsmobile built in that period, at one time or another, to include the Cutlass (1982-1988), Delta 88 (1980-1985), Regency 98 (1980-1984), Toronado (1980-1985), and Custom Cruiser (1980-1990). (3)

The 307 shares the same stroke as all the other Olds small-blocks (3.385") and has a bore of 3.800" for a total of 307.12 cubic inches. It was used in cars from every GM brand (Buick, Cadillac, Chevrolet, Oldsmobile, and Pontiac).  The 307 was also the last carbureted V8 that General Motors manufactured.

• Technical overview of the 307
• Cleaning out the EGR passages
• Differences between the 5A and 6A/7A heads
• Differences between the Y and 9 engines
• Modifying: 13-second 307 recipe