Exhaust Header for Dodge W100 W150 Plymouth Trailduster (1967-1978) 6.3L 6.6L 7.2L

High-Flow Stainless Exhaust Header for 1967-1978 Dodge, Plymouth W100, W150, Trailduster

What it Does: The performance exhaust header replaces the restrictive factory cast-iron exhaust manifolds on the 1967-1978 Dodge W100, W150, and Plymouth Trailduster to reduce exhaust backpressure, optimize scavenging, and improve engine operating efficiency.

The Stock Dodge, Plymouth W100, W150, Trailduster Exhaust Manifold Restriction

Factory big-block exhaust manifolds fitted to 1967-1978 Chrysler B/RB engine platforms suffer from extremely tight casting radii, asymmetric runner lengths, and restrictive collector necks. Over decades of heat cycling, stock cast-iron units are notoriously prone to cracking, warpage across the cylinder head mating surfaces, and sheared mounting studs. Internally, turbulence and excessive backpressure choke exhaust gas velocity, causing elevated cylinder head temperatures and scavenging reversion that directly compromises mid-range torque.

The Engineering Solution

This direct-replacement exhaust header utilizes premium stainless steel construction engineered to withstand extreme thermal cycles without structural failure. Smooth, mandrel-bent primary tubes maintain uniform cross-sectional diameter to preserve laminar exhaust gas flow and accelerate cylinder evacuation. Precision TIG-welded, heavy-duty flanges resist thermal warping and eliminate blowouts at the cylinder head interface. Merging into a low-restriction collector, this bolt-on system unlocks exhaust velocity, reduces parasitic pumping losses, and provides adequate clearance around steering shafts, leaf springs, and 4WD transfer case linkages on the vintage D-Series / W-Series chassis.

Technical Specifications

Compatibility

• 1967-1978 Dodge W100 6.3L 383ci, 6.6L 400ci, 7.2L 440ci Big Block V8
• 1975-1978 Dodge W150 6.6L 400ci, 7.2L 440ci Big Block V8
• 1974-1978 Plymouth Trailduster 6.6L 400ci, 7.2L 440ci Big Block V8

Frequently Asked Questions

Does this fit the D/W-Series W100, W150, Trailduster?
Yes, this is a direct fit for the 1967-1978 Dodge and Plymouth W100, W150, and Trailduster models equipped with the Chrysler B/RB V8 engine series.

Do the header bolts require retorquing after installation?
Yes, all header flange fasteners should be re-torqued after an initial thermal cycle to ensure gasket retention and prevent exhaust leaks.

The Dodge, Plymouth Truck Durability Standard

Designed for heavy towing, sustained hauling, and severe-duty four-wheel-drive demands, this stainless steel header eliminates cracked manifold failures while providing the low-end pulling torque essential for vintage Mopar trucks.