A design that has stood the test of time. Our headers are one piece construction (not sleeved) with equal length tubes for maximum horsepower and torque. Designed so the starter can be removed with the headers in place and to clear the steering and clutch link-age. Made of 16 gauge 1 1/2” diameter tubing for smooth flow into the 2 1/2” collectors, they follow the same route as the stock exhaust system. Utilizes a 3/8” thick flange for strength and to prevent gasket blow out. They fit 289, 302/5.0 and 351W/5.8 conversions. Will not work with GT-40P heads. Compatible with C4 and AOD automatics and manual transmissions. C6 transmissions will require modification. The Duffy's Original with the passenger side design updated in 2001 to fit better with our #5350 Radius Arms. Come with hardware, gaskets and instructions.*

These feature a complete inside and out metallic ceramic coating that resists temperatures up to 1600° F, is incredibly rust, chip and abrasion resistant, lowers under hood temperature and has an aluminum look that does not blue.

*The regulation of emissions production, noise levels, and safety standards is undertaken by the federal government, each of the fifty state legislatures and by many local municipalities, towns and counties. California Vehicle Code Sections 27156 and 38391 prohibit the advertising, offering for sale, or installation of any device which modifies a vehicle’s emission control system unless exempted. James Duff headers have not received an exemption from these code sections and are not legal for sale or use in California on vehicles originally equipped with catalytic converters. It is illegal, except for vehicles only driven off-road, to remove or otherwise render inoperative any emission control device on regulated motor vehicles. In the other 49 states, it- is the responsibility of the ultimate consumer to check federal and local laws to determine if JDI products are legal for use on their vehicle.