121 Buick Gran Sport 440 Stage 1 Convertible (1970) STF 714 H by Robert Knight Via Flickr: Buick Gran Sport 440 Stage 1 Convertible (1970) Engine 440 cu in (7457cc) V8 Registration Number STF 714 H (Lancashire) BUICK ALBUM www.flickr.com/photos/45676495@N05/sets/72157623635632257... The Gran Sport name has been used on several high-performance cars built by Buick since 1965. Skylark based Gran Sports The 1965 Skylark Gran Sport was the intermediate Buick Skylark with the Gran Sport option added. Although a 300 cu in (5 L) V8 was already offered in the Skylark, the Gran Sport had the largest engine permitted by GM - a 401 cu in (7 L) Buick V8 (called a 400 by Buick because that was the maximum engine size allowed in intermediate body cars). In 1970 the 400 was replaced by the 440 with the Buick 455 cu in (7.5 L) V8 engine, used in the GS 455. The base model was rated at 350 bhp (355 PS) In the optional Stage 1 trim equipped with a single 4-barrel Rochester Quadrajet carburettor was rated at 360 bhp (365 PS) As with all American engines produced prior to the 1972 model year, these were SAE gross ratings, which are generally significantly higher than SAE net ratings and are not indicative of what actual production engines produced (with all engine accessories and full exhaust system in place. Dennis Manner, Buick Engine development engineer quoted the production-line pulled engine dyno test results from 1970 where the lowest HP output of the 15 tested 455 Stage 1 engines was roughly 425 hp. The Stage 1 engine option used cylinder heads that, while using raw castings of the same pattern as all of the other Buick 455s sharing the same model year, were machined differently in order to accept larger valves and to produce smaller compression chambers for increased static compression ratio. The option also included a more aggressive camshaft, a specially tuned 4-barrel Quadrajet carburetor, more aggressive ignition timing,5/8 inch oil pickup tube and a higher numerical final drive, and was available with either Turbo Hydra-matic 400 3-speed automatic transmission, or a Muncie M-21 (not m22) 4-speed manual transmission Like all of the GM versions of this body style in this period, the convertible chassis was considerably more robust than the hardtop version. In fact, the convertible chassis was a full box frame chassis that had numerous lightening holes Diolch am 99,742,280 o olygiadau gwych, mae pob un ohonynt yn cael eu gwerthfawrogi'n fawr. Thanks for 99,742,280 amazing views, every one is greatly appreciated. Shot 12.11.2022, at the Classic Car Show, NEC, Marston Green, Birmingham REF 167-121
