—SMIt seems ironic that during the late '70s more 403 Oldsmobile motors were installed in Pontiac Firebirds than in Olds 442s, but it's true. Between 1977 and 1979, 279,026 Trans Ams rolled off 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 ...