The new-for-1971 Buick LeSabre, like this Sandpiper Beige hardtop coupe, was one of the largest-ever GM full size series, sharing the same basic platform with the full-size Chevies, Pontiacs, and Oldsmobiles.
At the same time, it was also powered by the first round of de-tuned Detroit smog motors.
The base motor in this 18.5-foot long, 4200 pound boulevard barge was a 2bbl 350 V8 with an 8.5:1 compression ratio that wheezed out 155 SAE net bhp (230 SAE gross).
Optionally, you could get a 4bbl 350 with dual exhausts and bump the horsepower to 195 net (260 gross).
The more upmarket LeSabre Custom also offered a 455 4bbl as an option (230/315 net/gross bhp).
.