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.<\/p>\n
3\/8″ Thick machined flanges…no warping
\nCNC mandrel bent tubes… accurate fit & better flow
\nPrecision formed long transition collectors and long tube design… reduces backpressure and increases higher RPM horsepower
\nHeavy 16 gauge tubing…longer life
\nTubes are pre-polished to remove scratches and the header isfinished with a Hi-Temp Black Coating
\nDoug’s Headers D103-B 1 3\/4″ 4-Tube Full Length Header AMC Javelin V8 68-79 Hi-Temp Black Coating
\nBlack
\nCollector: 3
\nPort Shape: SAP
\nPrimary Tube: 1 3\/4
\nDog leg exhaust port
\nemissions code: legal only for off-highway use (except in California or states that have adopted California emission standards)
\nwith: No A\/C
\nDoug’s Headers D103-B 1 3\/4″ 4-Tube Full Length Header AMC Javelin V8 68-79 Hi-Temp Black Coating
\nBlack
\nCollector: 3
\nPort Shape: SAP
\nPrimary Tube: 1 3\/4
\nDog leg exhaust port
\nemissions code: legal only for off-highway use (except in California or states that have adopted California emission standards)
\nwith: No A\/C
\nApplication<\/p>\n
1969 American Motors AMX 4.7L\/290 V8
\n1969 American Motors AMX 5.6L\/343 V8
\n1970 American Motors AMX 5.9L\/360 V8
\n1970-1979 American Motors AMX 5L\/304 V8
\n1969-1970 American Motors AMX 6.4L\/390 V8
\n1969 American Motors Javelin 4.7L\/290 V8
\n1969 American Motors Javelin 5.6L\/343 V8
\n1970-1974 American Motors Javelin 5.9L\/360 V8
\n1970-1974 American Motors Javelin 5L\/304 V8
\n1969-1970 American Motors Javelin 6.4L\/390 V8
\n1971-1974 American Motors Javelin 6.6L\/401 V8<\/p>","protected":false},"excerpt":{"rendered":"
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 […]\n","protected":false},"featured_media":5603,"comment_status":"closed","ping_status":"open","template":"","meta":{"_joinchat":[]},"product_brand":[],"product_cat":[456],"product_tag":[],"class_list":["post-5602","product","type-product","status-publish","has-post-thumbnail","product_cat-headers","first","instock","taxable","shipping-taxable","purchasable","product-type-simple"],"yoast_head":"\n