Item Description:
For sale is an original GM intake plenum removed from a 1985 Chevrolet Corvette C4 equipped with the L98 5.7L Tuned Port Injection (TPI) engine.

This is the upper portion of the TPI system, also known as the intake plenum, and includes the following:

Cast aluminum GM part with “Tuned Port Injection” lettering

Factory mounting studs and vacuum ports intact

No cracks, broken flanges, or stripped threads

Surface shows typical wear and grime from age/use


Perfect for a restoration project, performance build, or TPI conversion setup.


---

Fitment:

Fits 1985–1991 Chevrolet Corvette C4 with L98 5.7L TPI engines

May also fit 1985–1992 Camaro/Firebird with TPI setups

Will not fit LT1, LT4, LS-series, or Crossfire Injection engines



---

Condition:

Structurally sound

Minor cosmetic wear, but no major damage

Vacuum and mounting points are in good shape

Removed from a running engine – sold as-is



---

Specs (Approximate):

Length: 19 inches

Width: 10 inches

Height: 4.5 inches

Weight: ~8–10 lbs