Engine Summary
- Manufacturer
- Chevrolet
- Family
- Chevrolet Vega aluminum four-cylinder
- Displacement
- 122 cubic inches
Also Known As
1975 Cosworth Twin Cam1975 Z09 engine1975 VIN-code E engine
Engine profile
1975 Chevrolet Cosworth 122 DOHC four
Chevrolet Vega aluminum four-cylinder · 122 cubic inches · Chevrolet
Identification reference
Engine Details
Source-backed component numbers, codes, stampings, and application notes.
Cosworth aluminum cylinder head
- Value
- dual overhead camshafts and four valves per cylinder
- Application
- belt-driven cam carrier on the de-stroked Vega aluminum block
- Type
- cylinder head / specification
- Car pages
- 1975 Chevrolet Cosworth Vega
Sources: 1975 Chevrolet Cosworth Vega Service and Overhaul Manual Supplement , Cosworth Vega engine at the GM Heritage Center
Cosworth Twin Cam 122
- Value
- 3.50 x 3.16 inches, 8.5:1 compression, 110 hp and 107 lb-ft
- Application
- standard and exclusive to the 1975 Cosworth Vega
- Type
- engine assembly / specification
- Car pages
- 1975 Chevrolet Cosworth Vega
Sources: 1975 Chevrolet Cosworth Vega Service and Overhaul Manual Supplement , 1975-76 Cosworth Vega buyer's guide
1975 VIN engine code
- Value
- E
- Application
- fifth VIN position on an individual 1975 Cosworth Vega
- Type
- other / assembly code
- Car pages
- 1975 Chevrolet Cosworth Vega
Sources: 1975 Chevrolet Cosworth Vega project sold January 20, 2026 , Cosworth Vega VIN decoder
Cars Using This Engine
1 linked car page.
two-door hatchback coupe
1975 Chevrolet Cosworth Vega
122-cu-in DOHC four, 110 hp