In 1961 Oldsmobile offered the three series of cars; Dynamic 88, Super 88 and the 98. The first two series came on a 123-inch-wheelbase with an overall length of 212 inches. The major difference between the two were interior trim and engine.
The Oldsmobile Dynamic 88 had a 250-horsepower version of the 394-cubic-inch engine, while the Super 88 version was rated at 325-HPthanks to higher compression ratio and a four-barrel carburetor. Syncromesh manual transmission was offered as an option to the standard Hydra-matic on the 88’s.
The Oldsmobile 98 was only available with the 325 HP engine and Hydra-matic automatic transmission. The 98 came with a wheelbase of 126 inches and was over all six inches longer than the 88, most of the extra length was added to the passenger compartment.
All 61 Pontiac’s were 3 1/2 inches narrower and 3 to 5 1/2 inches shorter than previous years.