6th Oct 2014, 13:19
Buick had its own 455 V8 in the 1970s, completely different than Oldsmobile's "rocket". Pontiac also had a different 455, and Chevrolet's 454.
None of the 455s ever got mixed and matched between brands, but it was common with the 350s towards the end of the 1970s. Buick, Olds, Chevy, and possibly even Pontiac all had their own unique 350 V8 too. The Chevrolet and Oldsmobile 350 were better performing and more reliable in my opinion.
In the 1970s there was a Pontiac 400 V8 in there somewhere too, and it may be different than the late 1970s Trans Am motor.
Oldsmobile used a 403 small block from 1977-1979 (internals were similar to the 350, but the engine was not as reliable). It was shared with Buick.
Do some reading on why the V8 powered 1985 LeSabre is a bad motor (as well as the Olds Delta 88). Same 307 V8 as before, but the cylinder heads were reconstructed to meet emissions standards, causing them to perform very poorly. 1984 is the best year for the full size Buick/Olds of the 1980s.
28th Dec 2013, 11:45
Most of the early 80s LeSabres ever produced have alas long since gone to the crusher, and plenty of those that remain do have high mileage.
A well preserved, low mileage car of this type and this age is quite rare, and will only become more valuable.