Upgrading the exhaust on your classic A-body, F-body, or G-body with a small block Chevy? Speed Engineering's 1-3/4" SBC longtube headers are a direct-fit upgrade across the most popular 1970–1981 GM platforms — mandrel bent, TIG-welded, and CNC-machined with rectangular ports, a 3-1/2" collector with merge spike, and zinc header bolts included. Compatible with the full SBC small block family from 267 through 400 cubic inches, including 305 and 350. Built from 304 natural stainless steel with standard graphite manifold gaskets included. Dyno proven.
⚠️ Important Note: These headers will NOT work on LT1 engines.
Features:
- 1-3/4" Primary Tubes — Sized for improved flow on SBC 267-400 applications
- 1-3/4" x 1-1/2" Rectangular Ports — Matches standard SBC rectangular port cylinder head configurations
- 3-1/2" Collector with Merge Spike — Optimized merge geometry for strong low-to-mid RPM torque
- Longtube Header Design — Maximum scavenging efficiency vs. shorty or mid-length headers
- Mandrel Bent Tubing — Consistent tube diameter throughout; no crimping, no restriction
- CNC Machined Flanges — Precision fit at the cylinder head for a leak-free seal
- 17-3/8" Center to Center Outer Bolt Holes — Standard SBC bolt spacing for direct fitment verification
- 304 Natural Stainless Steel Construction — Corrosion resistant, heat tolerant, and built to last
- Standard Graphite Manifold Gaskets Included
- 10x1.5x25 Zinc Header Bolts Included
- Compatible with SBC 267, 305, 350, and 400 V8 Engines
- V8 Engines Only
- Dyno Proven
Vehicle Applications:
Chevrolet Camaro (RWD) — SBC 267-400
- 1970 Chevrolet Camaro (RWD) — SBC 267-400
- 1971 Chevrolet Camaro (RWD) — SBC 267-400
- 1972 Chevrolet Camaro (RWD) — SBC 267-400
- 1973 Chevrolet Camaro (RWD) — SBC 267-400
- 1974 Chevrolet Camaro (RWD) — SBC 267-400
- 1975 Chevrolet Camaro (RWD) — SBC 267-400
- 1976 Chevrolet Camaro (RWD) — SBC 267-400
- 1977 Chevrolet Camaro (RWD) — SBC 267-400
- 1978 Chevrolet Camaro (RWD) — SBC 267-400
- 1979 Chevrolet Camaro (RWD) — SBC 267-400
- 1980 Chevrolet Camaro (RWD) — SBC 267-400
- 1981 Chevrolet Camaro (RWD) — SBC 267-400
Chevrolet Malibu (RWD) — SBC 267-400
- 1970 Chevrolet Malibu (RWD) — SBC 267-400
- 1971 Chevrolet Malibu (RWD) — SBC 267-400
- 1972 Chevrolet Malibu (RWD) — SBC 267-400
- 1973 Chevrolet Malibu (RWD) — SBC 267-400
- 1974 Chevrolet Malibu (RWD) — SBC 267-400
- 1975 Chevrolet Malibu (RWD) — SBC 267-400
- 1976 Chevrolet Malibu (RWD) — SBC 267-400
- 1977 Chevrolet Malibu (RWD) — SBC 267-400
- 1978 Chevrolet Malibu (RWD) — SBC 267-400
- 1979 Chevrolet Malibu (RWD) — SBC 267-400
- 1980 Chevrolet Malibu (RWD) — SBC 267-400
- 1981 Chevrolet Malibu (RWD) — SBC 267-400
Chevrolet Monte Carlo (RWD) — SBC 267-400
- 1970 Chevrolet Monte Carlo (RWD) — SBC 267-400
- 1971 Chevrolet Monte Carlo (RWD) — SBC 267-400
- 1972 Chevrolet Monte Carlo (RWD) — SBC 267-400
- 1973 Chevrolet Monte Carlo (RWD) — SBC 267-400
- 1974 Chevrolet Monte Carlo (RWD) — SBC 267-400
- 1975 Chevrolet Monte Carlo (RWD) — SBC 267-400
- 1976 Chevrolet Monte Carlo (RWD) — SBC 267-400
- 1977 Chevrolet Monte Carlo (RWD) — SBC 267-400
- 1978 Chevrolet Monte Carlo (RWD) — SBC 267-400
- 1979 Chevrolet Monte Carlo (RWD) — SBC 267-400
- 1980 Chevrolet Monte Carlo (RWD) — SBC 267-400
- 1981 Chevrolet Monte Carlo (RWD) — SBC 267-400
Oldsmobile Cutlass (RWD) — SBC 267-400
- 1970 Oldsmobile Cutlass (RWD) — SBC 267-400
- 1971 Oldsmobile Cutlass (RWD) — SBC 267-400
- 1972 Oldsmobile Cutlass (RWD) — SBC 267-400
- 1973 Oldsmobile Cutlass (RWD) — SBC 267-400
- 1974 Oldsmobile Cutlass (RWD) — SBC 267-400
- 1975 Oldsmobile Cutlass (RWD) — SBC 267-400
- 1976 Oldsmobile Cutlass (RWD) — SBC 267-400
- 1977 Oldsmobile Cutlass (RWD) — SBC 267-400
- 1978 Oldsmobile Cutlass (RWD) — SBC 267-400
- 1979 Oldsmobile Cutlass (RWD) — SBC 267-400
- 1980 Oldsmobile Cutlass (RWD) — SBC 267-400
- 1981 Oldsmobile Cutlass (RWD) — SBC 267-400
Buick Regal (RWD) — SBC 267-400
- 1970 Buick Regal (RWD) — SBC 267-400
- 1971 Buick Regal (RWD) — SBC 267-400
- 1972 Buick Regal (RWD) — SBC 267-400
- 1973 Buick Regal (RWD) — SBC 267-400
- 1974 Buick Regal (RWD) — SBC 267-400
- 1975 Buick Regal (RWD) — SBC 267-400
- 1976 Buick Regal (RWD) — SBC 267-400
- 1977 Buick Regal (RWD) — SBC 267-400
- 1978 Buick Regal (RWD) — SBC 267-400
- 1979 Buick Regal (RWD) — SBC 267-400
- 1980 Buick Regal (RWD) — SBC 267-400
- 1981 Buick Regal (RWD) — SBC 267-400
Frequently Asked Questions:
Q: Will these headers work with an LT1 engine?
No. These headers will not work on LT1 engines. They are designed for the traditional SBC small block family (267, 305, 350, and 400 cubic inches).
Q: What SBC engine sizes are these headers compatible with?
These headers are compatible with the full SBC small block family from 267 through 400 cubic inches, including the common 305 and 350.
Q: What port shape do these headers use?
These headers use 1-3/4" x 1-1/2" rectangular ports, compatible with standard SBC rectangular port cylinder head configurations.
Q: What is the bolt hole spacing on these headers?
The outer bolt holes are 17-3/8" center to center, matching standard SBC head bolt spacing.
Q: What bolts are included?
10x1.5x25 zinc header bolts are included with the headers.
Q: Do these headers fit 1982 and newer G-body cars like the Monte Carlo SS or Grand National?
These headers are confirmed for 1970–1981 applications. Later G-body model years (1982+) may have different chassis or engine bay configurations — verify fitment for your specific year before ordering.
Q: What material are these headers made from?
304 natural stainless steel with full TIG-welded construction, CNC-machined flanges, and merge spike.
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).