Engine profile

1971 Holden HQ Monaro engine family

Holden Red inline-six, Holden V8, and Chevrolet small-block V8 · 350 cubic inches · General Motors-Holden / Chevrolet

Exact-year LS engine bay showing a Chevrolet 350 installation, Quadrajet air-cleaner context, radiator, power brake hardware, air conditioning, battery, and inner structure. Component originality remains car-specific. 1971 Holden Monaro

Engine Summary

Manufacturer: General Motors-Holden / Chevrolet
Family: Holden Red inline-six, Holden V8, and Chevrolet small-block V8
Displacement: 350 cubic inches

Also Known As

1971 HQ Monaro engine familyHQ Monaro 173 and 202 Red sixesHQ Monaro 253 and 308 Holden V8s1971 HQ Monaro Chevrolet 350

Identification reference

Engine Details

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

GTS 350 induction

Value: Single Rochester Quadrajet four-barrel, 750-cfm historic specification
Application: 1971 HQ Monaro GTS 350
Type: carburetor / specification
Car pages: 1971 Holden Monaro

Sources: Holden HQ Monaro GTS 350 approved historic vehicle specification

173 high-compression Red six

Value: 173 cu in; 9.4:1; 118 bhp at 4,400 rpm; 168 lb-ft at 2,000 rpm
Application: 80337 regular Monaro baseline
Type: engine assembly / specification
Car pages: 1971 Holden Monaro

Sources: HQ model pricing effective 23 July 1971 , HQ Monaro specifications

202 high-compression Red six

Value: 202 cu in; 9.4:1; 135 bhp; 194 lb-ft
Application: 80337 regular Monaro or 81137 Monaro LS
Type: engine assembly / specification
Car pages: 1971 Holden Monaro

Sources: HQ model pricing effective 23 July 1971 , HQ Monaro specifications

253 high-compression Holden V8

Value: 253 cu in; 9.0:1; two-barrel; 185 bhp at 4,400 rpm; 262 lb-ft at 2,400 rpm
Application: 80437 Monaro, 81237 LS, or 80837 GTS
Type: engine assembly / specification
Car pages: 1971 Holden Monaro

Sources: HQ model pricing effective 23 July 1971 , HQ Monaro specifications

308 Holden V8

Value: 308 cu in; 9.0:1; Quadrajet; 240 bhp at 4,000 rpm; 315 lb-ft at 3,000 rpm
Application: 80437 Monaro, 81237 LS, or 80837 GTS
Type: engine assembly / specification
Car pages: 1971 Holden Monaro

Sources: HQ model pricing effective 23 July 1971 , HQ Monaro specifications