and wanted to know if the motor mounts were the same as a Chevy 350
back then, all of the GM divisions had their own engine designs, all of which were completely different and don't share anything major. for instance, all of the lower divisions produced "350" badged motors, all of which had different real displacements.
Buick == 349.31 ci 3.800" x 3.850"
Olds == 350.06 ci 4.057" x 3.385"
Poncho == 353.98 ci 3.876" x 3.750"
Chevy == 349.85 ci 4.000" x 3.480"
you'll notice that the Pontiac is almost 354 cubes while the Olds has the biggest bore. Buick has both the least true displacement and the narrowest bore, good thing it weighs ~100lbs less than the Chevy.
the Buick will connect to a BOPC ( Buick, Olds, Pontiac, Cadillac ) trans but NOT a Chevy bell housing. the BOPC bell pattern shares only the two alignment dowels and the bottom two bolt holes with the Chevy, the other four holes above the dowels have different spacing. there are dual pattern bells ( especially on 200r4 transmissions ) which will bolt up to both types.
there were three different configurations of 350 available for the Le Sabre in 1970, 'SB' and 'SO' codes are not very desireable. if you happen to have an 'SP' code engine, that was factory rated at 315hp and was the highest output ever available from a Buick small block. an 'SP' code would be desirable for the high compression pistons it would have.
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