Company (which became part of British Leyland in 1968), and its successor companies constantly improved the engine making it much stronger and more reliable. Capacities ranged from . This engine was used for V8 versions of the MGB GT known as the GTV8. Rover also used the engine in the 1970 Range Rover. Morgan used the Rover version in its Plus 8. American 215s have also been engine swapped into countless other platforms, especially Chevrolet Vegas and later British cars including the MG RV8 in the 1990s, Triumph TR8, and various sports sedans and sports cars by the MG Rover Group and specialist manufacturers such as TVR. The engine remains well-supported by enthusiast clubs, specialist parts suppliers, and by shops that specialize in conversions and tuning. In the mid-1980s, hot rodders realized the 215 could be stretched to as much as , using the Buick 300 crankshaft, new cylinder sleeves, and an assortment of non-Buick parts. It could also be fitted with high-compression cylinder heads from the Morgan Plus 8. Using the 5 liter Rover block and crankshaft, a maximum displacement of is theoretically possible. 300 In 1964, Buick replaced the 215 with an iron-block engine of very similar architecture. The new "small block" engine had a bore of and a stroke of for a displacement of . It retained the aluminum cylinder heads, intake manifold, and accessories of the 215 for a dry weight of . The 300 was offered in two-barrel form, with 9.0:1 compression, making at 4600 rpm and at 2400 rpm, and four-barrel form, with 11.0:1 compression, making at 4800 rpm and at 3000 rpm. For 1965, the 300 switched to cast-iron heads, raising dry weight to , still quite light for a V8 engine of its era. The four-barrel option was cancelled for 1966, and the 300 was replaced entirely by the 350 in 1968. In 1964, while nearly all Buick engines were painted "Buick Late Green", the 300ci V8s were painted Silver instead. In 1966 Buick engines switched to "Buick Late Red", but until 1967 at least, the 300 V8 (and the 225) were still painted Buick Late Green. The Apollo 5000 GT sports car, (also sold as the Vetta Ventura) used this engine. 340 In 1966, the 300's stroke was increased to to create the 340 () as a replacement for the four-barrel-carbureted 300. It was offered with two- or four-barrel carburetion, the