Your information is good up until you state the Factory assembled 15 Stage 2 units. The Factory never produced ANY Stage 2 cars. All of them were only dealer installed packages. The closest the factory ever came to producing one was when Denny Manner (the chief engineer on the Stage 2 project) sent the prototype Stage 2 heads and package to Reynolds Buick for testing on the mule car which was campaigned as the Kenne-Bell car. The factory produced about 75 pairs of these heads and that was it. There are three prominent Stage 2's with a race history. The Reynolds car, the Jones/Benisek car and the Jim Turner car. Denny states that the factory may or may not have produced a Stage 2 GSX for testing which may or may not have survived. It all just adds to the mystic history of the awesome car :)
Buick GSX Stage 2 (3.42 final drive) specs
|Curb weight||1758 kg (3876 lbs)|
|Dimensions||5.14 m (202 in) long, 1.96 m (77 in) wide, 1.35 m (53 in) high|
|Wheelbase||2.85 m (112 in)|
|Origin country||United States|
|Engine type||GM Buick Big-Block V-8 455|
|Displacement||7.5 l (455 ci / 7456 cc)|
|Power||426 ps (420 bhp / 313 kw) @ 4600 rpm|
|Torque||689 Nm (508 lb-ft) @ 2800 rpm|
|Power / liter||57 ps (56 hp)|
|Power / weight||242 ps (239 bhp) / t|
|Torque / weight||392 Nm (289 lb-ft) / t|
|Transmission||Muncie M21/M22 4 speed manual (3.42 ratio)|
|Layout||front engine, rear wheel drive|
GSX Stage 2 competition
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Tommy 7y ago
TimboW128 10m ago
Not exactly true. There were 2 factory test vehicles under Denny's command. I've got documentation, and also worked at Buick Engineering on Buick V6 Stage development, and on the Indy V6 program. Also, I grew up in Flint MI, and my father was Mfg. Engineer in the foundry and oversaw casting on the Stage 2 V8 heads.
Scott Farley 2m ago
Sir. The Factory did build one Stage 2 for testing. Check it out.
Super8 9y ago
There is little documentation about the 12 Stage 2 cars that were sold. One was campaigned by Kenne-Bell/Reynolds Buick and the other was known as the Jones-Benisek car. The Jones/Benisek car is known to have been delivered as a Stage 1 car with all the Stage 2 components in the trunk in GM boxes. Stage 2 package included special D- Port exhaust port Stage 2 heads, matching Kustom brand headers, a radical cam, high compression forged pistons, Edelbrock B4B aluminum intake, Holley carburetor, and other equipment for racing. Few Stage 2s were ever used on the street and Buick only ever factory assembled 15 Stage 2 test units.
Super8 9y ago
@ Eryk03: I really losing my cool. Can u fix the torque into 510 ft-lbs?
Super8 9y ago
The dealer installation of GSX but with optional 3.42 final which is rare to see and also it might be the only car that fitted with Muncie M22 Rock Crusher wide ratio with 3.42 final because Muncie M20 can't handle such a big torque close to 500 ft-lbs. Stage 2 is one of the powerful engine in 1970 considering the power can reach 400 Hp in net figures. The milder Stage 1 version has 360 net according to wikipedia which mean same as gross rating power.