Originally Posted By: Ted Schefelbein
....In 69 and 70 the factory produced F85 and Cutlass W31 models, with factory blueprinted 350 motors that would happily run down the strip in front of most of the big blocks cars of the era, when a set of headers and slicks were bolted on....

A '70 Cutlass W31 was the the model the fellow had. It was something else looking under the hood and seeing a factory aluminum intake manifold with W31 on it. And, the cast exhaust manifolds had long runners on it, semi headers style. It seemed much more free revving than a good friend who had a '70 W30, a torquey motor but it wouldn't get going like the big block Chevy's could.