Hedman Hedders has been manufacturing quality headers in the USA since 1954, and classic musclecars is their specialty. Each set uses mild steel, smooth flowing, CNC mandrel bent tubes, that are hand-welded to ensure each pair is identical to the next. These headers use Hedman's patented TIGHT TUBES chamshell-style collector that allows for a low-profile header design, while still providing beneficial exhaust flow improvement over factory manifolds.

These BLACK-MAXX coated, TIGHT-TUBES headers fit a variety of 1967-1974 MOPAR passenger cars powered by Chrysler'S 273-360 LA engine (inline port port pattern only). Included in this list of popular models are 1970-74 Dodge Challenger, '67-74 Plymouth Barracuda, '66-74 Dodge Charger, '68-74 Plymouth Roadrunner 67-76 Dart, Duster, Super Bee and Valiant (check the application listings for exact fitment). The flat-style collector also makes these headers ideal for SB Chrysler equipped street rods and custom projects. These headers fit both manual and automatic transmission models, however, a mini-starter must be used, and modification to the shift linkage may be required. The smooth 1-5/8 in. tubes flow into the large, yet flat, collector, and provide improved exhaust flow, over factory manifolds, to let your Chrysler 273-360 (LA) engine produce additional horsepower and torque.

Each set includes a pair of header and collector gaskets, header flange bolts and collector bolts.

Hedman Hedders is so confident in the quality of its headers that these headers are factory backed by a Limited Lifetime Warranty. These headers have a high temperature, SATIN-BLACK ceramic finish that resists corrosion, and can withstand temperatures up to 1400 degree F. This finish is covered by a 5-year factory warranty, in addition to Hedman's standard lifetime header warranty.

Features

Hedman Tight Tubes Headers
Mopar 318-360
1-5/8 In. Tube Diameter
2-1/2 In. Collector- Black-Maxx Satin Black Ceramic-Coated, Mild Steel

Application

1970-1974 Dodge Challenger Base CID 318 Naturally Aspirated GAS
1970-1973 Dodge Challenger Base CID 340 Naturally Aspirated GAS
1971-1974 Dodge Challenger Base CID 360 Naturally Aspirated GAS
1970-1971 Dodge Challenger R/T CID 340 Naturally Aspirated GAS
1972 Dodge Challenger Rallye CID 318 Naturally Aspirated GAS
1972 Dodge Challenger Rallye CID 340 Naturally Aspirated GAS
1972 Dodge Challenger Rallye CID 360 Naturally Aspirated GAS
1970 Dodge Challenger T/A CID 340 Naturally Aspirated GAS
1969-1971 Dodge Charger 500 CID 318 Naturally Aspirated GAS
1970-1971 Dodge Charger 500 CID 340 Naturally Aspirated GAS
1971 Dodge Charger 500 CID 360 Naturally Aspirated GAS
1967 Dodge Charger Base CID 273 Naturally Aspirated GAS
1966-1974 Dodge Charger Base CID 318 Naturally Aspirated GAS
1970-1973 Dodge Charger Base CID 340 Naturally Aspirated GAS
1971-1974 Dodge Charger Base CID 360 Naturally Aspirated GAS
1967-1971 Dodge Charger R/T CID 318 Naturally Aspirated GAS
1969 Dodge Charger SE CID 318 Naturally Aspirated GAS
1971-1974 Dodge Charger Special Edition CID 318 Naturally Aspirated GAS
1971-1973 Dodge Charger Special Edition CID 340 Naturally Aspirated GAS
1971-1974 Dodge Charger Special Edition CID 360 Naturally Aspirated GAS
1971 Dodge Charger Super Bee CID 318 Naturally Aspirated GAS
1971 Dodge Charger Super Bee CID 340 Naturally Aspirated GAS
1967-1968 Dodge Coronet 440 CID 273 Naturally Aspirated GAS
1967-1970 Dodge Coronet 440 CID 318 Naturally Aspirated GAS
1970 Dodge Coronet 440 CID 340 Naturally Aspirated GAS
1967-1968 Dodge Coronet 500 CID 273 Naturally Aspirated GAS
1967-1970 Dodge Coronet 500 CID 318 Naturally Aspirated GAS
1970 Dodge Coronet 500 CID 340 Naturally Aspirated GAS
1967 Dodge Coronet Base CID 273 Naturally Aspirated GAS
1967 Dodge Coronet Base CID 318 Naturally Aspirated GAS
1970-1974 Dodge Coronet Base CID 318 Naturally Aspirated GAS ...See Application Guide for Additional Fitments

Specs

Manufacturer Specs:

TUBE DIAMETER	1-5/8 in.
TUBE STYLE	Tight Tubes
AIR CONDITIONING	Yes
AUTOMATIC TRANSMISSION - COLUMN	Yes
AUTOMATIC TRANSMISSION - FLOOR	Yes
MANUAL TRANSMISSION - COLUMN	Yes
MANUAL TRANSMISSION - FLOOR	Yes
POWER STEERING	Yes
COLLECTOR ATTACHMENT	3 in.
COLLECTOR DIAMETER	3 in.
COLLECTOR SIZE	3 in.
COLLECTOR STYLE	3-Bolt Gasket Style Flange
REDUCER OUTLET SIZE	2-1/2 in.
EXHAUST SYSTEM DIA	2-1/2 in.
CONTENTS	headers, gaskets (when applicable), 3-bolt exhaust adapters, hardware
ENGINE	Mopar SB 318-360 (inline port pattern only)
FINISH	BLACK MAXX Satin Black Ceramic-Metallic
FINISH TYPE	BLACK MAXX- Black Ceramic-Metallic Coating
FLANGE STYLE	Standard
FLANGE THICKNESS	0.3125 in.
HEADER STYLE	TIGHT TUBES
MATERIAL	Mild Steel
TRANSMISSION NOTES	Modification to shifter linkage may be required.
TUBE DESIGN	Standard
TUBE LENGTH	Tight Tubes
TUBE MATERIAL THICKNESS	16g
TUBE SIZE	1-5/8 in.
WITH AIR SYSTEM	No
WITH EGR	No
EO	No
WELD-UP	No
TUNED	No
BOLTS/STUDS INCLUDED	Yes
CATALYTIC CONVERTERS INCLUDED	No
CROSSOVER PIPE INCLUDED	No
GASKET OR SEAL INCLUDED	Yes
HEADER FASTENERS INCLUDED	Yes
INSTALLATION HARDWARE INCLUDED	Yes
MOTOR MOUNTS INCLUDED	No
MOUNTING HARDWARE INCLUDED	Yes
REDUCERS INCLUDED	Yes
Y-PIPE INCLUDED	No
QUANTITY	Sold as a pair.
PRIMARY TUBE GAUGE	16g
PRIMARY TUBE DIAMETER IN	1.625 in.
PACKAGE CONTENTS	Headers, reducers (exhaust adapters), gaskets, mounting hardware
HEADER MATERIAL	Mild Steel
HEADER FINISH	BLACK MAXX Satin Black Ceramic-Metallic
CYLINDER HEAD PORT SHAPE	Rectangle
CYLINDER HEAD	Stock Profile Heads
HEADER CONSTRUCTION	MILD STEEL- Standard-Duty
REPLACEMENT GASKET	41827490
REPLACEMENT HEAD FLANGE GASKET	41827490
HEADER PORT SHAPE	Rectangle Port
PORT SHAPE	Rectangle
COLLECTOR BOLTS INCLUDED	Yes
PRODUCT DETAILS	Chrysler LA Engines Only (inline port pattern). Not For A318 Engine

Guides & Documents

Headers Installation Instructions (41878503)

CARB Warning

For race/ off road use or for use on pre-1966 vehicles.

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway, or if installed in vehicles model-year 1965 or older; motorcycles model-year 1977 or older; or off-highway recreational vehicles (such as off-road motorcycles and all-terrain vehicles) model-year 1996 and older. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

CA WARNING:

Can expose you to lead, a carcinogen and reproductive toxicant. See www.P65Warnings.ca.gov

CARB warning

Hedman Hedders 78503 Specifications

KEY SPECS
MFG. Part #	78503
Brand	Hedman Hedders
Exhaust Port Shape	Rectangle
Primary Tube Diameter	1-5/8"
Material Type	Mild Steel
Color	Black
Weld-Up	No
Collector Diameter	3 Inch
Finish	Satin
Hardware Included	Yes
Gasket(s) Included	Yes
Collector Reducers Included	Yes
Collector Reducer Exit Diameter	2.5"

GENERAL
Sold in Quantity	Set
Collector Length	3"
Flange Thickness	0.3125"
Tuned	No
Crossover Pipe Included	No
Primary Tube Gauge	16-gauge

Ratings & Reviews

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Questions & Answers

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Fitment

1975-1980 Chrysler Cordoba

318 LA Engine Mopar
360 Mopar

1981-1983 Chrysler Cordoba

318 LA Engine Mopar

1983-1989 Chrysler Fifth Avenue

318 LA Engine Mopar

1981-1983 Chrysler Imperial

318 LA Engine Mopar

1977 Chrysler LeBaron

318 LA Engine Mopar

1978-1979 Chrysler LeBaron

318 LA Engine Mopar
360 Mopar

1980-1981 Chrysler LeBaron

318 LA Engine Mopar

1977-1978 Chrysler New Yorker

360 Mopar

1979-1980 Chrysler New Yorker

318 LA Engine Mopar
360 Mopar

1981-1982 Chrysler New Yorker

318 LA Engine Mopar

1971-1978 Chrysler Newport

360 Mopar

1979-1980 Chrysler Newport

318 LA Engine Mopar
360 Mopar

1981 Chrysler Newport

318 LA Engine Mopar

1978-1979 Chrysler Town & Country

318 LA Engine Mopar
360 Mopar

1981 Chrysler Town & Country

318 LA Engine Mopar

1964 Dodge 330

273 Mopar

1964 Dodge 440

273 Mopar

1963 Dodge 880

318 Poly

1964 Dodge 880

273 Mopar

1964-1966 Dodge A100

273 Mopar

1970 Dodge A100

318 LA Engine Mopar

1967-1970 Dodge A100 Pickup

273 Mopar
318 LA Engine Mopar

1964-1967 Dodge A100 Truck

273 Mopar

1968-1970 Dodge A100 Truck

318 LA Engine Mopar

1976-1980 Dodge Aspen

318 LA Engine Mopar
360 Mopar

1975 Dodge B100

318 LA Engine Mopar

1976-1978 Dodge B100

318 LA Engine Mopar
360 Mopar

1979-1980 Dodge B100

318 LA Engine Mopar

1971-1974 Dodge B100 Van

318 LA Engine Mopar
360 Mopar

1981-1991 Dodge B150

318 LA Engine Mopar

1975-1980 Dodge B200

318 LA Engine Mopar
360 Mopar

1971-1974 Dodge B200 Van

318 LA Engine Mopar
360 Mopar

1981 Dodge B250

318 LA Engine Mopar
360 Mopar

1982-1983 Dodge B250

318 LA Engine Mopar

1984-1991 Dodge B250

318 LA Engine Mopar
360 Mopar

1992-1994 Dodge B250

360 Mopar

1975-1980 Dodge B300

318 LA Engine Mopar
360 Mopar

1971-1974 Dodge B300 Van

318 LA Engine Mopar
360 Mopar

1981-1991 Dodge B350

318 LA Engine Mopar
360 Mopar

1992-1994 Dodge B350

360 Mopar

1973-1980 Dodge CB300

318 LA Engine Mopar
360 Mopar

1970 Dodge Challenger

318 LA Engine Mopar
340 Mopar

1971-1973 Dodge Challenger

318 LA Engine Mopar
340 Mopar
360 Mopar

1974 Dodge Challenger

318 LA Engine Mopar
360 Mopar

1966-1967 Dodge Charger

273 Mopar

1968-1969 Dodge Charger

318 LA Engine Mopar

1970 Dodge Charger

318 LA Engine Mopar
340 Mopar

1971-1973 Dodge Charger

318 LA Engine Mopar
340 Mopar
360 Mopar

1974-1978 Dodge Charger

318 LA Engine Mopar
360 Mopar

1965-1967 Dodge Coronet

273 Mopar

1968 Dodge Coronet

273 Mopar
318 LA Engine Mopar

1969 Dodge Coronet

318 LA Engine Mopar

1970 Dodge Coronet

318 LA Engine Mopar
340 Mopar

1971-1973 Dodge Coronet

318 LA Engine Mopar
340 Mopar
360 Mopar

1974-1976 Dodge Coronet

318 LA Engine Mopar
360 Mopar

1962-1963 Dodge Custom

318 Poly

1964-1965 Dodge Custom

273 Mopar

1975-1979 Dodge D100

318 LA Engine Mopar
360 Mopar

1986-1988 Dodge D100

318 LA Engine Mopar
360 Mopar

1989 Dodge D100

318 LA Engine Mopar

1968-1970 Dodge D100 Pickup

318 LA Engine Mopar

1971-1974 Dodge D100 Pickup

318 LA Engine Mopar
360 Mopar

1977-1982 Dodge D150

318 LA Engine Mopar
360 Mopar

1983 Dodge D150

318 LA Engine Mopar

1984-1991 Dodge D150

318 LA Engine Mopar
360 Mopar

1993 Dodge D150

360 Mopar

1975-1980 Dodge D200

318 LA Engine Mopar
360 Mopar

1968-1970 Dodge D200 Pickup

318 LA Engine Mopar

1971-1974 Dodge D200 Pickup

318 LA Engine Mopar
360 Mopar

1981-1982 Dodge D250

318 LA Engine Mopar
360 Mopar

1983 Dodge D250

318 LA Engine Mopar

1984-1991 Dodge D250

318 LA Engine Mopar
360 Mopar

1992-1993 Dodge D250

360 Mopar

1975-1980 Dodge D300

318 LA Engine Mopar
360 Mopar

1968-1970 Dodge D300 Pickup

318 LA Engine Mopar

1971-1974 Dodge D300 Pickup

318 LA Engine Mopar
360 Mopar

1981-1983 Dodge D350

318 LA Engine Mopar
360 Mopar

1984-1993 Dodge D350

360 Mopar

1989-1991 Dodge Dakota

318 LA Engine Mopar

1964-1967 Dodge Dart

273 Mopar

1968-1969 Dodge Dart

273 Mopar
318 LA Engine Mopar
340 Mopar

1970 Dodge Dart

318 LA Engine Mopar
340 Mopar

1971-1973 Dodge Dart

318 LA Engine Mopar
340 Mopar
360 Mopar

1974-1976 Dodge Dart

318 LA Engine Mopar
360 Mopar

1977 Dodge Diplomat

318 LA Engine Mopar

1978-1979 Dodge Diplomat

318 LA Engine Mopar
360 Mopar

1980-1989 Dodge Diplomat

318 LA Engine Mopar

1968-1974 Dodge M300

318 LA Engine Mopar

1978-1979 Dodge Magnum

318 LA Engine Mopar
360 Mopar

1960 Dodge Matador

318 Poly

1970-1974 Dodge MB300

318 LA Engine Mopar

1980 Dodge Mirada

318 LA Engine Mopar
360 Mopar

1981-1983 Dodge Mirada

318 LA Engine Mopar

1968-1970 Dodge Monaco

318 LA Engine Mopar

1971-1978 Dodge Monaco

318 LA Engine Mopar
360 Mopar

1960-1961 Dodge Phoenix

318 Poly

1960-1961 Dodge Pioneer

318 Poly

1964-1967 Dodge Polara

273 Mopar

1968-1970 Dodge Polara

318 LA Engine Mopar

1971 Dodge Polara

318 LA Engine Mopar
360 Mopar

1972-1973 Dodge Polara

318 LA Engine Mopar
340 Mopar
360 Mopar

1974-1981 Dodge Ramcharger

318 LA Engine Mopar
360 Mopar

1982-1983 Dodge Ramcharger

318 LA Engine Mopar

1984-1991 Dodge Ramcharger

318 LA Engine Mopar
360 Mopar

1992-1993 Dodge Ramcharger

360 Mopar

1978-1980 Dodge RD200

318 LA Engine Mopar
360 Mopar

1975 Dodge Royal Monaco

318 LA Engine Mopar
360 Mopar

1976 Dodge Royal Monaco

360 Mopar

1977 Dodge Royal Monaco

318 LA Engine Mopar
360 Mopar

1960-1961 Dodge Seneca

318 Poly

1979-1980 Dodge St. Regis

318 LA Engine Mopar
360 Mopar

1981 Dodge St. Regis

318 LA Engine Mopar

1975-1977 Dodge W100

318 LA Engine Mopar
360 Mopar

1984-1988 Dodge W100

318 LA Engine Mopar
360 Mopar

1989 Dodge W100

318 LA Engine Mopar

1959 Dodge W100 Pickup

318 Poly

1968-1971 Dodge W100 Pickup

318 LA Engine Mopar

1972-1974 Dodge W100 Pickup

318 LA Engine Mopar
360 Mopar

1960-1966 Dodge W100 Series

318 Poly

1967 Dodge W100 Series

318 LA Engine Mopar

1977-1981 Dodge W150

318 LA Engine Mopar
360 Mopar

1982-1983 Dodge W150

318 LA Engine Mopar

1984-1991 Dodge W150

318 LA Engine Mopar
360 Mopar

1993 Dodge W150

360 Mopar

1975-1980 Dodge W200

318 LA Engine Mopar
360 Mopar

1959 Dodge W200 Pickup

318 Poly

1968-1970 Dodge W200 Pickup

318 LA Engine Mopar

1971-1974 Dodge W200 Pickup

318 LA Engine Mopar
360 Mopar

1960-1966 Dodge W200 Series

318 Poly

1967 Dodge W200 Series

318 LA Engine Mopar

1981-1982 Dodge W250

318 LA Engine Mopar
360 Mopar

1983 Dodge W250

318 LA Engine Mopar

1984-1991 Dodge W250

318 LA Engine Mopar
360 Mopar

1992-1993 Dodge W250

360 Mopar

1975-1978 Dodge W300

318 LA Engine Mopar
360 Mopar

1979 Dodge W300

360 Mopar

1980 Dodge W300

318 LA Engine Mopar
360 Mopar

1959 Dodge W300 Pickup

318 Poly

1968-1970 Dodge W300 Pickup

318 LA Engine Mopar

1971-1974 Dodge W300 Pickup

318 LA Engine Mopar
360 Mopar

1960-1966 Dodge W300 Series

318 Poly

1967 Dodge W300 Series

318 LA Engine Mopar

1981 Dodge W350

360 Mopar

1982-1983 Dodge W350

318 LA Engine Mopar
360 Mopar

1984-1993 Dodge W350

360 Mopar

1964-1967 Plymouth Barracuda

273 Mopar

1968 Plymouth Barracuda

273 Mopar
318 LA Engine Mopar
340 Mopar

1969-1970 Plymouth Barracuda

318 LA Engine Mopar
340 Mopar

1971-1973 Plymouth Barracuda

318 LA Engine Mopar
340 Mopar
360 Mopar

1974 Plymouth Barracuda

318 LA Engine Mopar
360 Mopar

1958-1961 Plymouth Belvedere

318 Poly

1964-1967 Plymouth Belvedere

273 Mopar

1968 Plymouth Belvedere

273 Mopar
318 LA Engine Mopar

1969-1970 Plymouth Belvedere

318 LA Engine Mopar

1971 Plymouth Belvedere

340 Mopar

1965-1967 Plymouth Belvedere II

273 Mopar

1970 Plymouth Cuda

318 LA Engine Mopar
340 Mopar

1971-1973 Plymouth Cuda

318 LA Engine Mopar
340 Mopar
360 Mopar

1974 Plymouth Cuda

318 LA Engine Mopar
360 Mopar

1958-1961 Plymouth Custom

318 Poly

1970-1973 Plymouth Duster

318 LA Engine Mopar
340 Mopar

1974-1976 Plymouth Duster

318 LA Engine Mopar
360 Mopar

1960-1963 Plymouth Fleet Special

318 Poly

1957-1959 Plymouth Fury

318 Poly

1964-1965 Plymouth Fury

273 Mopar

1968-1970 Plymouth Fury

318 LA Engine Mopar

1971-1978 Plymouth Fury

318 LA Engine Mopar
360 Mopar

1968-1970 Plymouth Fury I

318 LA Engine Mopar

1971-1974 Plymouth Fury I

318 LA Engine Mopar
360 Mopar

1965 Plymouth Fury II

273 Mopar

1966 Plymouth Fury II

318 Poly

1967-1970 Plymouth Fury II

318 LA Engine Mopar

1971-1974 Plymouth Fury II

318 LA Engine Mopar
360 Mopar

1965 Plymouth Fury III

273 Mopar

1966 Plymouth Fury III

318 Poly

1967-1970 Plymouth Fury III

318 LA Engine Mopar

1971-1974 Plymouth Fury III

318 LA Engine Mopar
360 Mopar

1972-1977 Plymouth Gran Fury

318 LA Engine Mopar
360 Mopar

1980 Plymouth Gran Fury

318 LA Engine Mopar
360 Mopar

1981-1989 Plymouth Gran Fury

318 LA Engine Mopar

1967 Plymouth GTX

273 Mopar

1968-1969 Plymouth GTX

318 LA Engine Mopar

1958 Plymouth Plaza

318 Poly

1971 Plymouth Roadrunner

340 Mopar

1972-1973 Plymouth Roadrunner

318 LA Engine Mopar
340 Mopar

1974-1975 Plymouth Roadrunner

318 LA Engine Mopar
360 Mopar

1965-1967 Plymouth Satellite

273 Mopar

1968 Plymouth Satellite

273 Mopar
318 LA Engine Mopar
340 Mopar

1969-1970 Plymouth Satellite

318 LA Engine Mopar
340 Mopar

1971-1973 Plymouth Satellite

318 LA Engine Mopar
340 Mopar
360 Mopar

1974 Plymouth Satellite

318 LA Engine Mopar
360 Mopar

1958-1959 Plymouth Savoy

318 Poly

1964 Plymouth Savoy

273 Mopar

1971-1976 Plymouth Scamp

318 LA Engine Mopar

1960-1961 Plymouth Sport Wagon

318 Poly

1958-1961 Plymouth Suburban

318 Poly

1974-1981 Plymouth Trailduster

318 LA Engine Mopar
360 Mopar

1964-1967 Plymouth Valiant

273 Mopar

1968-1969 Plymouth Valiant

273 Mopar
318 LA Engine Mopar
340 Mopar

1970 Plymouth Valiant

318 LA Engine Mopar
340 Mopar

1971-1973 Plymouth Valiant

318 LA Engine Mopar
340 Mopar
360 Mopar

1974 Plymouth Valiant

318 LA Engine Mopar
360 Mopar

1975 Plymouth Valiant

318 LA Engine Mopar

1976 Plymouth Valiant

318 LA Engine Mopar
360 Mopar

1967 Plymouth VIP

318 LA Engine Mopar

1976-1980 Plymouth Volare

318 LA Engine Mopar
360 Mopar