Upgrading the exhaust on your classic Pontiac GTO or Oldsmobile 442? Speed Engineering's 1-3/4" longtube headers are a direct-fit, dyno-proven upgrade built from 304 natural stainless steel with mandrel-bent primary tubes, CNC-machined flanges, and a 3.5" collector with merge spike. Compatible with SBC and a wide range of Pontiac and Oldsmobile V8 engines from 5.3L through 7.4L across both platforms. Zinc header bolts and standard graphite manifold gaskets included.
⚠️ Important: Some transmission linkages and Z-bars may need modification or relocation for proper fitment with these headers.
Features:
- 1-3/4" Round Port Primary Tubes — Full-diameter flow from cylinder head to collector for maximum exhaust scavenging
- 3.5" Collector with Merge Spike — Large collector optimized for high-displacement V8 performance
- Longtube Header Design — Maximum scavenging efficiency vs. shorty or mid-length headers
- Mandrel Bent Tubing — Consistent tube diameter through every bend; no crimping, no restriction
- CNC Machined Flanges — Precision fit at the head and collector for a leak-free seal
- 18" Center to Center Outer Bolt Holes — Correct bolt spacing for GTO and 442 head configurations
- 304 Natural Stainless Steel Construction — Corrosion resistant, heat tolerant, and built to last
- Standard Graphite Manifold Gaskets Included
- 3/8"-16x3/4" Zinc Header Bolts Included
- Compatible with 326, 350, 389, 400, 428, and 455 V8 Engines
- V8 Engines Only
Vehicle Applications:
Pontiac GTO (RWD)
- 1964 Pontiac GTO (RWD) — 326/350/389/400/428/455 V8
- 1965 Pontiac GTO (RWD) — 326/350/389/400/428/455 V8
- 1966 Pontiac GTO (RWD) — 326/350/389/400/428/455 V8
- 1967 Pontiac GTO (RWD) — 326/350/389/400/428/455 V8
- 1968 Pontiac GTO (RWD) — 326/350/389/400/428/455 V8
- 1969 Pontiac GTO (RWD) — 326/350/389/400/428/455 V8
- 1970 Pontiac GTO (RWD) — 326/350/389/400/428/455 V8
- 1971 Pontiac GTO (RWD) — 326/350/389/400/428/455 V8
- 1972 Pontiac GTO (RWD) — 326/350/389/400/428/455 V8
Oldsmobile 442 (RWD)
- 1964 Oldsmobile 442 (RWD) — 326/350/389/400/428/455 V8
- 1965 Oldsmobile 442 (RWD) — 326/350/389/400/428/455 V8
- 1966 Oldsmobile 442 (RWD) — 326/350/389/400/428/455 V8
- 1967 Oldsmobile 442 (RWD) — 326/350/389/400/428/455 V8
- 1968 Oldsmobile 442 (RWD) — 326/350/389/400/428/455 V8
- 1969 Oldsmobile 442 (RWD) — 326/350/389/400/428/455 V8
- 1970 Oldsmobile 442 (RWD) — 326/350/389/400/428/455 V8
- 1971 Oldsmobile 442 (RWD) — 326/350/389/400/428/455 V8
- 1972 Oldsmobile 442 (RWD) — 326/350/389/400/428/455 V8
Frequently Asked Questions:
Q: Will my transmission linkage or Z-bar need modification? Some transmission linkages and Z-bars may require modification or relocation for proper fitment with these headers. Verify your specific drivetrain configuration before ordering.
Q: What engines are these headers compatible with? These headers are compatible with 326, 350, 389, 400, 428, and 455 V8 engines in the listed 1964–1972 Pontiac GTO and Oldsmobile 442 applications.
Q: What is the bolt hole spacing on these headers? The outer bolt holes are 18" center to center, matching the correct head bolt spacing for these applications.
Q: What bolts are included? 3/8"-16x3/4" zinc header bolts are included with the headers.
Q: What is the collector size on these headers? These headers feature a 3.5" collector with merge spike — sized for maximum flow on high-displacement V8 applications.
Q: What material are these headers made from? 304 natural stainless steel with full TIG-welded construction and CNC-machined flanges.
Q: Are gaskets included? Yes. Standard graphite manifold gaskets are included with the headers.
Q: Are these headers street legal? No. These are race-only headers intended for closed-course competition use only. Installation on a street-driven vehicle may violate the Clean Air Act (42 U.S.C. 7522(a)(3)).
⚠️ Race Use Only: This product is manufactured and sold for installation on vehicles used solely for competition. Once installed, the vehicle may not be used, registered, or licensed for use on a public road or highway. Installation on a street-driven vehicle may violate the Clean Air Act 203(a)(3), 42 U.S.C. 7522(a)(3).