Buick GRAND SPORT 455
Below are specifications for a custom-built, performance long block BUICK 455 CI with 360-400 hp and 440 ft lbs torque!
- Buick 455 block bored, honed, decked and align honed
- Performance camshaft:
- 238/238 @ .050
- .500 lift
- 114 lobe center
- New Performance cam bearings
- Balanced rotating assembly with balancer
- Reground 3.90” stroke crankshaft
- Resized rods with ARP® rod bolts
- New performance bearings
- Performance pistons with Molly® rings (add 400.00 for forged)
- 10/1 compression
- New Performance timing set
- New Performance high volume oil pump kit
- ARP head bolts.
- Cylinder heads:
- Stage 2 Porting (add 695.00)
- 2.00”/1.62” new stainless valves
- Matching valve springs
- 3 angle seats
- bronze guides
- positive seals
- New push rods, rocker shafts stamped rockers
- New performance gasket set
- Valve bowl porting included.
- Painted Buick red or blue
Your cost $3795.00 plus core and shipping
History of the Buick 455 V8 Engine
The 455.72 in?? (7.5 L) 455 Buick V8 Engine used a 4.312 in bore and 3.90 in stroke. It was produced from 1970 to 1976 and was based on the 400/430 V8. The regular Buick 455 Engine was conservatively rated at 350 hp (261 kW) while the 455 Stage 1 was underrated at 360 hp (269 kW). The regular 455 could produce 410 to 420 hp (306 to 313 kW) while the Stage 1 produced 415 to 425 hp (310 to 317 kW). The hp was somewhat reduced in 1971, mainly due to the reduction in cylinder compression ratio in order to cope with the introduction new federal laws requiring new cars to use unleaded gas in an effort to reduce exhaust emissions, then, on paper, considerably reduced to approximately 250 hp starting in 1972, due to the new measurement of horsepower as SAE Net horsepower rather than a gross horsepower rating. Tightening emissions controls caused the engine to drop in power, a little at a time, through 1976. Most parts except the pistons interchange with the 400 and 430.