1969 68 Pontiac Firebird Long Branch D-Port Exhaust Manifolds – RARE OEM GM Pair

**Original GM Pontiac Long Branch Exhaust Manifold Set – Correct for 1968 1969 Firebird 400HO / Ram Air III (D-Port) but will fit other years and engines with D-Port Heads** This is a genuine **pair of factory GM cast-iron Long Branch D-port exhaust manifolds** removed from my **1969 Pontiac Firebird 400HO**. Original California car I personally restored as my first car in 1987. I’ve owned these manifolds ever since — they are authentic originals, _not reproductions_. **🔧 Casting Details** - **RH (Passenger Side):** Casting number **9797073**, dated **J218** (October 21, 1968) - Correct for **1969 model year production** - Found on 1969 Firebird 400HO and Ram Air III engines (and some 428HO Grand Prix applications) - **LH (Driver Side):** Casting number **9779495**, no visible date code (common on this casting) - Features large embossed **“8”** and clear **“OC” foundry stamp** beneath the casting number - “OC” denotes **Owatonna Casting**, a legitimate GM supplier used in the late 1960s **🧩 Condition** - Excellent original condition for 55-year-old factory castings - No cracks, no welded repairs, no broken bolt ears - Original mounting surfaces intact - Typical age patina consistent with stored, used factory parts **🔎 Authenticity Notes** - These are **true GM originals**, not modern reproductions - The **OC foundry stamp** and **J218 date code** verify authentic late-1968 Pontiac production - Correct fitment for **1968–1969 Firebird 400 / 400HO / Ram Air III D-port applications** - Will also fit other D-port Pontiac engines with matching Long Branch downpipes (e.g., some GTO or Grand Prix setups) **✅ Summary** If you’re restoring a **’69 Firebird 400HO, Ram Air III, or 428HO**, these are the correct long-branch D-port manifolds you want — genuine GM castings, period-correct date code, and original foundry marks. Hard to find in this condition with known history. Correct factory application is **1968–1969 Firebird 400 / 400HO / Ram Air III (D-port engines)**.  These manifolds **will also bolt onto 1967 Firebird D-port heads** and other Pontiac D-port engines (326 / 389 / 350 / 400 / 428 / 455), though minor exhaust pipe adjustments may be required for chassis clearance. \*326 Bolt pattern matches.

• Manufacturer Part Number: 9797073, 9779495, 9779495 (LH), 9797073 (RH)
• Material: Cast Iron
• Vintage Part: Yes
• Placement on Vehicle: Left, Right
• Brand: General Motors
• Interchange Part Number: 9797073, 9779495, 9791607
• Manufacturer Warranty: No Warranty
• Unit Quantity: Pair
• Universal Fitment: Direct replacement
• Finish: Original Unrestored Cast Iron
• Country of Origin: United States
• Performance Part: Yes