For those of you who may not think "Oldsmobile" and "performance" are synonymous terms, Oldsmobile's performance heritage dates all the way back to 1903, when an Olds-built "Flyer" established the ...

First, the 403 is based on a block with a 9.330-inch deck height (as are the 260, 307, 330, and 350 engines). The 400, 425, and 455 engines use a taller block with a 10.625-inch deck height—hence the ...