Every Doug’s header is tuned with the proper tube size and length to efficiently remove all the exhaust from each cylinder, reducing pumping losses resulting in a dramatic increases in horsepower and torque. Doug’s headers are carefully developed on the vehicles they are intended to fit and are re-checked numerous times during the design and manufacturing process.
3/8″ Thick machined flanges…no warping
CNC mandrel bent tubes… accurate fit & better flow
Precision formed long transition collectors and long tube design… reduces backpressure and increases higher RPM horsepower
Heavy 16 gauge tubing…longer life
Tubes are pre-polished to remove scratches and the header isfinished with a Hi-Temp Black Coating
Doug’s Headers D103-B 1 3/4″ 4-Tube Full Length Header AMC Javelin V8 68-79 Hi-Temp Black Coating
Black
Collector: 3
Port Shape: SAP
Primary Tube: 1 3/4
Dog leg exhaust port
emissions code: legal only for off-highway use (except in California or states that have adopted California emission standards)
with: No A/C
Doug’s Headers D103-B 1 3/4″ 4-Tube Full Length Header AMC Javelin V8 68-79 Hi-Temp Black Coating
Black
Collector: 3
Port Shape: SAP
Primary Tube: 1 3/4
Dog leg exhaust port
emissions code: legal only for off-highway use (except in California or states that have adopted California emission standards)
with: No A/C
Application
1969 American Motors AMX 4.7L/290 V8
1969 American Motors AMX 5.6L/343 V8
1970 American Motors AMX 5.9L/360 V8
1970-1979 American Motors AMX 5L/304 V8
1969-1970 American Motors AMX 6.4L/390 V8
1969 American Motors Javelin 4.7L/290 V8
1969 American Motors Javelin 5.6L/343 V8
1970-1974 American Motors Javelin 5.9L/360 V8
1970-1974 American Motors Javelin 5L/304 V8
1969-1970 American Motors Javelin 6.4L/390 V8
1971-1974 American Motors Javelin 6.6L/401 V8
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