68-77 Olds Headers 350/403

The Flowtech 68-77 Olds Headers 350/403 are full-length performance exhaust headers engineered for Oldsmobile V8 engines in Cutlass models spanning 1968 through 1977. These headers feature 1.75-inch primary tubes that converge into a 3-inch collector, a proven configuration that optimizes scavenging efficiency across the RPM band typical of classic Oldsmobile powerplants. Constructed from durable steel with a professional black paint finish, this pair arrives complete with gaskets and hardware for a straightforward installation.

The 1.75-inch primary diameter balances backpressure and flow characteristics needed for displacement engines in this vintage era, preventing excessive scavenging losses while improving exhaust velocity. The 3-inch collector consolidates exhaust pulses efficiently, reducing turbulence and improving overall engine breathing. Full-length headers—as opposed to shorty designs—deliver superior performance gains by extending the scavenging pulse window, a critical factor for 350 and 403 cubic-inch Oldsmobile V8s seeking measurable horsepower and torque increases. The included gasket set and mounting hardware eliminate the need for separate purchases, streamlining the installation process.

Cutlass owners pursuing bolt-on performance modifications will find these Flowtech headers compatible with stock or mildly modified engines, offering one of the most effective upgrades for increasing exhaust flow without extensive engine work. Whether restoring a classic Cutlass to original performance specs or building a street cruiser, these headers address the restrictive OEM exhaust manifolds that limit output from Oldsmobile's larger displacement V8 engines. The black paint finish provides both corrosion resistance and a finished appearance inside the engine bay.