Mandrel-bent tubing on every header
No crush bends. Ever. Mandrel bending keeps the inside diameter constant from flange to collector — which is the difference between a header that flows and one that chokes your exhaust.
Canton, Ohio · Est. 1978
Real horsepower. On real American V8s. Built by hand in Ohio.
Thorley Headers has been mandrel-bending, hand-porting and shipping bolt-on exhaust headers out of a 38,000 sq-ft shop in Canton for 45 years. If it bolts to a small-block, big-block, Windsor, modular or Hemi — we make the header.
- 412,000+Header sets shipped
- 1,860+SKUs in stock
- 4.9/58,300+ verified reviews
Find your header in 60 seconds
Start with the engine in the bay.
Pick your platform. We'll route you to the right header family, the matching part numbers, and the torque gain range from our dyno logs. Not sure which way the engine came from the factory? Call a tech.
01
Small Block Chevy
- Gain range+18–27 ft-lbs torque
- SKUs in stock340+
- Featured seriesTHY-283 Tri-Y
02
Big Block Chevy
Browse BBC Headers →03
Ford Windsor & Modular
Browse Ford Headers →04
Mopar B / RB / Hemi
Browse Mopar Headers →Not sure which header fits your combo? Talk to an ASE-certified tech — (330) 478-0000. Average pickup under 38 seconds.
Shop by vehicle · 1964–2024 coverage
1,860+ part numbers. If it's a V8, we have the header.
Restore, swap, or build — every Thorley part is in stock and bench-tested before it ships from Canton.
1967–2002
Chevrolet Camaro
212 part numbers
1964½–2024Ford Mustang
198 part numbers
1966–2023Dodge Charger
174 part numbers
1960–1987Chevy C10 Truck
156 part numbers
1964–1977Chevelle / El Camino
141 part numbers
1962–1979Chevrolet Nova
118 part numbers
1966–2024Ford Bronco
96 part numbers
1970–1974Mopar E-Body
88 part numbers
45 Years · Canton, Ohio · 47 Craftsmen
412,000+
Header sets shipped to 50 states & 38 countries
1,860+
SKUs in stock — largest header library in North America
4.9 / 5
Across 8,300+ verified reviews on Trustpilot & Speedway Motors
99.2%
On-time delivery over the last 5 years · 94% same-day ship
The Thorley difference
Built right in Canton. Built to outlast the car.
Four commitments we've kept since 1978. No crush bends, no offshore shortcuts, no fine print.
Patented Tri-Y design
Independent dyno testing by Engine Builder Magazine (March 2019) measured +18–27 ft-lbs of torque on small-block Chevy engines with our THY-283 series. Gains vary by combo, tune, and altitude — but the curve is real.
100% made in Ohio
All 47 craftsmen, engineers and warehouse staff work out of our 38,000 sq-ft facility in Canton. We don't import tubing, we don't relabel offshore blanks, we don't cut corners on a Tuesday afternoon.
Lifetime no-rust-through warranty
Honored on every header since 1982. If our tubing rusts through under normal use, we replace it. That's the warranty. That's the whole warranty.
"Forty-five years in, Thorley is still the yardstick. The Tri-Y small-block header bolted on, the car picked up two tenths and the torque curve flattened exactly where it should. Nobody else in the catalog is making tubing this consistently."
- 22features across Hot Rod, Car Craft, Super Chevy & Engine Masters TV
- 2016SEMA Global Media Award — Best New Engine Performance Product (THY-454 Tri-Y)
- ISO 9001:2015certified annually since 2009