Engine Summary
- Manufacturer
- Studebaker with Paxton Products
- Family
- Studebaker V-8
- Displacement
- 304 cubic inches
Also Known As
304.5 Studebaker R3Paxton-supercharged R3R3R3 304R3 304.5R3SStudebaker 304.5Studebaker R3 engine
Engine profile
Studebaker R3 304.5 supercharged V-8
Studebaker V-8 · 304 cubic inches · Studebaker with Paxton Products
Identification reference
Engine Details
Source-backed component numbers, codes, stampings, and application notes.
Factory R3 engine identity
- Value
- R3S prefix reported for factory Avanti R3 engine numbers
- Application
- original factory R3 installation
- Type
- block / stamp
- Location
- Boss at the top front of the block beside the left-front corner of the valley cover
- Car pages
- 1964 Studebaker Avanti R3
Later Paxton replacement engines can use different B-series numbering and require separate documentation.
Sources: 1964 Studebaker Avanti R3, serial R5642 , Studebaker V-8 engine identification , The Elusive 1964 Studebaker Avanti
R3 performance camshaft
- Value
- 276- or 288-degree specification reported by the marque reference
- Application
- R3 304.5 engine
- Type
- camshaft / specification
- Car pages
- 1964 Studebaker Avanti R3
Exact camshaft should be established from the individual engine's build documentation.
Sources: 1963-64 Studebaker Avanti buyer's guide , Studebaker Avanti R3 engines
Carter AFB four-barrel
- Value
- 650-cfm four-barrel enclosed in a pressurized aluminum box
- Application
- Paxton-supercharged R3
- Type
- carburetor / specification
- Car pages
- 1964 Studebaker Avanti R3
Sources: 1963-64 Studebaker Avanti buyer's guide , Studebaker Avanti R3 engines , The Elusive 1964 Studebaker Avanti
Special R3 cylinder heads
- Value
- Matched 64 cc chambers with enlarged 1.875-inch intake and 1.625-inch exhaust valves
- Application
- R3 304.5 engine
- Type
- cylinder head / specification
- Car pages
- 1964 Studebaker Avanti R3
Sources: 1963-64 Studebaker Avanti buyer's guide , Studebaker Avanti R3 engines
R3 engine assembly
- Value
- 304.5 cu in; 335 gross hp at 5,350 rpm; approximately 320 lb-ft
- Application
- nine factory-built 1964 Avanti R3 cars
- Type
- engine assembly / specification
- Car pages
- 1964 Studebaker Avanti R3
The often-repeated 400-hp figure describes a higher-output pulley and valve-spring configuration at 6,000 rpm, not the normal published customer rating.
Sources: 1963-64 Studebaker Avanti buyer's guide , Studebaker Avanti R3 engines , Studebaker V-8 engine identification , The Elusive 1964 Studebaker Avanti
R3 tubular exhaust headers
- Value
- Custom high-performance headers
- Application
- factory R3 engine
- Type
- exhaust manifold / specification
- Car pages
- 1964 Studebaker Avanti R3
Sources: 1963-64 Studebaker Avanti buyer's guide , Studebaker Avanti R3 engines
Prestolite Transigniter
- Value
- Transistor ignition with mechanical-advance distributor
- Application
- R3 engine
- Type
- ignition / specification
- Car pages
- 1964 Studebaker Avanti R3
Sources: Studebaker Avanti R3 engines , The Elusive 1964 Studebaker Avanti
Paxton centrifugal supercharger
- Value
- Approximately 6 psi boost in the customer R3 specification
- Application
- R3 pressure-box induction
- Type
- other / specification
- Car pages
- 1964 Studebaker Avanti R3
Sources: 1963-64 Studebaker Avanti buyer's guide , Studebaker Avanti R3 engines
Forged flat-top pistons
- Value
- 9.75:1 compression with matched chambers
- Application
- R3 304.5 engine
- Type
- piston / specification
- Car pages
- 1964 Studebaker Avanti R3
Sources: 1963-64 Studebaker Avanti buyer's guide , Studebaker Avanti R3 engines , The Elusive 1964 Studebaker Avanti
Cars Using This Engine
1 linked car page.
two-door four-passenger fiberglass coupe
1964 Studebaker Avanti R3
Supercharged 304.5 cu in R3 V-8