'67-'69 Camaro/Firebird & '68-'74 Nova Small Block Chevy X-Body headers Designed by SpeedTech Performance Specifically made for the Speed Tech Sub Frame. Will not work with a steering box. 1 3/4", .065 wall thickness, CNC mandrel bent primary tubes. CNC laser cut flanges, slip fit 3" OD collector. These headers fit perfectly without dimpling the primary tubes around the steering linkage. Long tube design provides awesome low end torque and street performance with excellent ground clearance. Sold less gaskets and fasteners. Mill finish. Will work with straight or angle plug heads. Will not work with factory A/C. These are the best fitting header and the only headers designed specifically for 68-74 Novas with our sub frame or stock sub frame! Designed specificaly to work around a 2 joint one shaft steering kit for all Unisteer rack and pinion conversions. Made exclusively by Stainless Works.