BRAND NEW SOUTHWEST SPEED PAINTED FLAT BLACK PERFORMANCE LONG TUBE HEADERS THAT ARE DIRECT FIT FOR 1968-1974 GM TRUCKS WITH BIG BLOCK CHEVY 396-454 CU. IN. ENGINES (SWS PART #440-2441). THIS PAIR OF SOUTHWEST SPEED PERFORMANCE LONG TUBE HEADERS OFFER AN IMMEDIATE INCREASE IN PERFORMANCE BY ELIMINATING BACKPRESSURE, IMPROVING EXHAUST FLOW, AND BUILDING MORE HORSEPOWER. THE CONSISTENT TUBING DIAMETER CONTRIBUTES TO THE SMOOTH AIR FLOW AND GREATER EXHAUST VELOCITY OF THESE HEADERS. THESE HEADERS ARE A DIRECT REPLACEMENT FOR 1968-1974 CHEVY & GMC TRUCKS, SUBURBANS, BLAZERS, AND JIMMYS WITH BIG BLOCK CHEVY 396-454 CU. IN. ENGINES. THESE HEADERS ARE GROUND PARALLEL WITH .380" FLANGES ON THE CYLINDER HEAD SURFACE, AND FEATURE 1 3/4" PRIMARY TUBES WITH 3" COLLECTORS, COMPLETE WITH HEADER BOLTS AND GASKETS AND REDUCER BOLTS AND GASKETS. INCLUDES A PAIR OF 2 1/2" REDUCERS TO COMPLETE THE INSTALLATION. WE STRONGLY RECOMMEND THAT YOU REFER TO OUR COMPATIBILITY LIST TO MAKE SURE THESE HEADERS FIT YOUR VEHICLE. FEATURES: PERFORMANCE LONG TUBE HEADERS 1 3/4" PRIMARIES TO THE 3" COLLECTORS 2 1/2" REDUCERS MORE PERFORMANCE INCREASES HORSEPOWER & TORQUE BETTER FUEL MILEAGE GREAT CHOICE TO REPLACE CAST IRON EXHAUST MANIFOLDS ENHANCES THE LOOKS OF THE ENGINE COMPARTMENT INCLUDES GASKETS AND MOUNTING HARDWARE PAINTED FLAT BLACK TO RESIST EARLY CORROSION DIRECT FIT APPLICATIONS: GM TRUCKS WITH BIG BLOCK CHEVY 396-454 CU. IN. ENGINES: CHEVY: 1/2 TON TRUCKS: 1968-1974 1/2 TON TRUCKS 2WD/4WD 3/4 TON TRUCKS: 1968-1974 3/4 TON TRUCKS 2WD/4WD 1 TON TRUCKS: 1968-1974 1 TON TRUCKS 2WD BLAZER: 1968-1974 K5 BLAZER 2WD 1973-1974 K5 BLAZER 4WD SUBURBAN: 1973-1974 SUBURBAN 2WD/4WD GMC: 1/2 TON TRUCKS: 1968-1974 1/2 TON TRUCKS 2WD/4WD 3/4 TON TRUCKS: 1968-1974 3/4 TON TRUCKS 2WD/4WD 1 TON TRUCKS: 1968-1974 1 TON TRUCKS 2WD JIMMY: 1968-1974 JIMMY 2WD 1973-1974 JIMMY 4WD SUBURBAN: 1973-1974 SUBURBAN 2WD/4WD IMPORTANT NOTES & EXCLUSIONS: 1. MUST MODIFY STOCK EXHAUST TO RETAIN CATALYTIC CONVERTER(S). 2. APPLICATIONS WITH OXYGEN SENSOR WILL REQUIRE PURCHASE OF REDUCERS WITH O2 FITTINGS. 3. WILL NOT FIT WITH A.I.R. (SMOG) PUMP. 4. MUST USE ORIGINAL FACTORY BIG BLOCK FRAME STANDS, MOTOR MOUNTS AND HARDWARE. 5. WORKS WITH AIR CONDITIONING. HEADER SPECS: MATERIAL TYPE: STEEL HEADER TUBE TYPE: LONG TUBE FLANGE THICKNESS: .380" FINISH: PAINTED FLAT BLACK HARDWARE INCLUDED: YES GASKETS INCLUDED: YES TUBE OUTSIDE DIAMETER: 1 3/4" COLLECTOR DIAMETER: 3" REDUCERS: 2 1/2" PAINT WARNING: THESE HEADERS ARE PAINTED WITH A HIGH HEAT DULL BLACK PAINT. IT WILL GENERALLY DULL EVEN MORE WHEN THE ENGINE IS STARTED. THE HEADER PAINT WILL SMOKE AND LET OFF AN ODOR THE FIRST FEW TIMES THE ENGINE IS UP TO TEMPERATURE AND THE BLACK FINISH WILL BECOME DULLER TURNING CLOSER TO GRAY IN COLOR. IF EXHAUST TEMPERATURES ARE EXTREME AT START THE PAINT WILL BLISTER AND PEEL. THERE IS NO WARRANTY ON HEADER PAINT. HEADER RETURN POLICY: PLEASE REFER TO THE HEADER MEASUREMENT CHART BELOW TO MAKE SURE THE HEADER WILL FIT YOUR VEHICLE AND APPLICATION BEFORE ORDERING. IN THE EVENT YOU ORDER A HEADER THAT WILL NOT FIT YOUR VEHICLE AND APPLICATION, YOU MAY RETURN THEM FOR A REFUND, PROVIDING YOU DONT DAMAGE THE HEADER. WHEN YOU RECEIVE THE HEADER THE FINISH WILL BE PROTECTED AND MUST REMAIN UNSCRATCHED FOR A REFUND. IF YOU BEND OR DIMPLE ANY OF THE TUBES OR SCRATCH THE FINISH, WE WILL NOT BE ABLE TO SELL THE HEADER AND WILL NOT BE ABLE TO PROCESS A REFUND. USE CARE WHEN TRIAL FITTING HEADERS. REPACK THEM WELL TO PREVENT DAMAGE RETURNING THEM TO US. WE WONT PROCESS REFUNDS FOR SCRATCHED, DIMPLED, DENTED, OR BENT HEADERS. YOU CAN VIEW AND DOWNLOAD THE COMPLETE ASSEMBLY INSTRUCTION BOOKLET FOR THESE HEADERS HERE.
