Buick Stage-1, Stage-2, Stage-3, etc.

Buick Stage-1, Stage-2, Stage-3 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……..

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