The Skylark Gran Sport came into the scene in 1965 as Buick‘s answer to the Pontiac GTO, but it was saddled with the “Nailhead” 401 that paled in comparison to Pontiac’s 389. Whereas the base motor for the Goat was 335 horsepower (with 360 optional), Buick made do with 325 horsepower. And while the big Buicks had an available 425 (even with dual quads), an edict at General Motors said that the Skylark couldn’t use that engine. It wasn’t until 1967 that Buick fielded a competitive motor for its rechristened GS400. This one on eBay may be the nicest there is.
The brand-new 400ci V-8 for the GS400 was rated at 340 horsepower – still lower than some other brands, but on the street, the GS400 was competitive. Sitting on top of the 400 was what Buick fans now call the “Star Wars” air cleaner. Made of red plastic, it may be