All generations

Porsche G-body G-Series / Impact Bumper

1974–1989 · Flat-6 Air-Cooled · Rear-engine, rear-wheel drive · 204–330 hp

The longest-running 911 generation. Defined by its iconic impact bumpers and the introduction of the legendary 930 Turbo with its whale tail spoiler.

Talk to G-body owners

Variants

911 Carrera 2.71974–1976 · 150 hp
911 Carrera 3.01976–1977 · 200 hp
911 SC1978–1983 · 180 hp
911 Carrera 3.21984–1989 · 231 hp
911 SC Targa1978–1983 · 180 hp
930 Turbo 3.01975–1978 · 260 hp
911 Carrera 3.2 Clubsport1987–1989 · 231 hp
930 Turbo 3.31978–1989 · 300 hp
911 Speedster (G-body)1989–1989 · 231 hp
930 Turbo SE/S Slantnose1981–1989 · 330 hp

What owners actually spend on the G-body

Median service costs from real logged records, broken down by job and category.

See G-body running costs

Known issues to look for

Timing Chain Tensioner Failure
critical
Rattling on cold start, chain noise at idle
Replace with updated Carrera-style tensioner; use OEM guides
Valve Guide Wear
moderate
Blue smoke on deceleration, increased oil consumption
Replace valve guides with bronze guides during top-end rebuild
Galvanic Corrosion at Steel/Aluminum Joints
moderate
Bubbling paint around fender/door joints, hidden corrosion
Regular inspection and treatment; cavity wax application
Turbo Wastegate Failure (930)
critical
Overboosting, uncontrolled boost spikes, potential engine damage
Inspect wastegate diaphragm annually; replace every 5 years

Documented G-body Porsches