Buick Stage-1, Stage-2, etc/. Engines/Option Packages

Buick started with "Stage" option packages in the '60s.........



Buick Stage-1

- 1969-1974
- Gran Sport and Riviera
- 400 C.I.D. (1969) -- 350hp/440tq. -- higher lift camshaft
-- larger diameter dual exhaust
-455 C.I.D. (1970-1974)
-- 360hp/510tq. (1970) -- 345hp/460tq. (1971) -- 270hp/390tq. (1972-1973) -- 245hp/350tq. (1974) -- 316/340 duration camshaft with .490" lift
- dual valve springs
-- 2.125" intake valves, 1.755" exhaust valves (vs. 2.0"/1.625" standard)
-- mild cylinder head porting -- recurved distributor
- 6% richer metering rods
- 60 psi oil pump
- larger oil pickup tube (1969-1970 only)
- chrome valve covers and hardware
- valve cover decals (1969)
- air cleaner decal (1970-1974)
- 7-blade cooling fan
- 10-bolt rear axle (standard)
- Posi-Traction differential unit
- performance axle ratio
-- 3.42 '69-'70 air conditioned cars
-- 3.64 '69-'70 non-air-condtioned cars
-- 3.42 '71-'74 all cars
- 12-bolt rear axle (rare)
- fender emblems (1970-1974)
- heavier duty TH400 transmission (if automatic equipped)
-- 6 plate clutch pack (vs. 5 standard)
-- 2.48 first gear
-- heavy duty servo



Buick Stage-2

- stating 1969
- over the counter package only
- not offered in production vehicles
- 75 sets were made public
- for big block Buicks
- round cylinder head exhaust ports
-- these heads are reputed to be worth 50+ horsepower over stock
- 340/360 duration camshaft with .455" intake and .480" exhaust lift
- hollow push rods - forged pistons - 60 psi oil pump
- Edelbrock B4B intake manifold
- 850 CFM Holley carburetor
- Mickey Thompson headers


Buick Stage-3

- 1970, then 2001
- over the counter package, then in the Blackhawk concept
- 455 C.I.D.
- 463hp/510tq.
- 13.5:1 compression ratio
- 4-bolt mains



more info to follow........