Engine profile

Buick 455 Stage 1 V8

Buick big-block V8 · 455 cubic inches · Buick

1970 Buick 455 Stage 1 big-block V8 engine-bay context. 1970 Buick GS Stage 1

Engine Summary

Manufacturer: Buick
Family: Buick big-block V8
Displacement: 455 cubic inches

Also Known As

Stage 1 455Buick 455 Stage 1455 V8 Stage 1455 cu in Stage 1 V8455 Stage 1Buick Stage 11970 Buick GS Stage 1 4551970 Buick GS 455 Stage 1GS455 Stage 1455 cubic-inch engineSS 455455/360 HP V-8455 Stage IBuick GS Stage 11971 Buick GS Stage 1 4551971 Buick GS 455 Stage 1GS 455 and Stage 1455-4 Stage 11971 V8 TS 455Gran Sport Stage 1 455 CID V-8TS 455 Stage 1Buick Gran Sport Stage 1 4551973 Buick Century GS Stage 1 455XS-code 455VIN V 455 Stage 1

Identification reference

Engine Details

Source-backed component numbers, codes, stampings, and application notes.

Stage 1 induction

Value: four-barrel carburetor with dual-snorkel air cleaner
Application: Stage 1 455, Gran Sport only
Type: air cleaner / specification
Car pages: 1973 Buick Century Gran Sport Stage 1 455

Sources: 1973 Buick Full Line Brochure

Engine production code

Value: XS
Application: 1973 Century Gran Sport Stage 1 455
Type: engine assembly / assembly code
Location: stamped engine production-code pad
Car pages: 1973 Buick Century Gran Sport Stage 1 455

Sources: US Buick Engine Production Codes

Factory output

Value: 270 hp SAE net and 390 lb-ft
Application: 1973 XS-code 455 Stage 1
Type: engine assembly / specification
Car pages: 1973 Buick Century Gran Sport Stage 1 455

Sources: 1973 Buick Century GS 455 Stage-1 Colonnade Sun Coupe , US Buick Engine Production Codes

Stage 1 cylinder-head equipment

Value: oversize valves, performance camshaft, and nickel-plated exhaust valves
Application: 1973 Stage 1 455
Type: valve train / specification
Car pages: 1973 Buick Century Gran Sport Stage 1 455

Sources: 1973 Buick Century GS 455 Stage-1 Colonnade Sun Coupe , 1973 Buick Full Line Brochure

Cars Using This Engine

6 linked car pages.

GS455 two-door Sport Coupe or Convertible Coupe

1970 Buick GS Stage 1

Factory Buick GS455 Stage 1 performance configuration

2-door Hardtop

1970 Buick GSX Stage 1

400 Stage 1 units (of 678 total GSX units)

Two-door sport coupe hardtop; convertible also documented

1971 Buick GS Stage 1

Factory Stage 1 option on 1971 Buick GS/GS 455 records

2-door hardtop / sport coupe

1971 Buick GSX Stage 1

GSX package on 1971 Buick GS, with Stage 1 455 selected.

2-door hardtop or convertible (GS series)

1972 Buick GS Stage 1

Factory GS Stage 1 performance configuration

two-door Colonnade hardtop coupe, including Sun Coupe

1973 Buick Century Gran Sport Stage 1 455

XS-code 455 CID Stage 1 V8

Source Trail

TeamBuick / Buick 1970 reference 1970 Buick Models, GS455 Production, and Stage 1 Reference

TeamBuick 1970 Buick engine specifications 1970 Buick Engine Number and Engine Specifications

TeamBuick 1970 Buick paint charts and codes 1970 Buick Paint Charts and Codes

TeamBuick 1970 Buick Chassis Service Manual index 1970 Buick Chassis Service Manual Index

Hemmings 1970 Buick GS 455 & GS 455 Stage 1 buyer guide 1970 Buick GS 455 and GS 455 Stage 1 Buyer Guide

Sports Car Market 1970 Buick GS 455 Stage 1 profile 1970 Buick GS 455 Stage 1 Profile

Mecum Kissimmee 2025 1970 Buick GS Stage 1 lot F319 1970 Buick GS Stage 1, Kissimmee 2025 Lot F319

Mecum Houston 2026 1970 Buick GS 455 Stage 1 lot S78.1 1970 Buick GS 455 Stage 1, Houston 2026 Lot S78.1