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FlowTech Long Tube Header, Black Paint 12102FLT

FlowTech Long Tube Header, Black Paint 12102FLT
FlowTech Long Tube Header, Black Paint 12102FLTFlowTech Long Tube Header, Black Paint 12102FLTFlowTech Long Tube Header, Black Paint 12102FLTFlowTech Long Tube Header, Black Paint 12102FLTFlowTech Long Tube Header, Black Paint 12102FLT
$400.99 ea
NEWARRIVING SOONEstimated Ship Date 11/24/2025 (If Ordered Today)100 Available from HOLLEY PERFORMANCE PRODUCTS as of 11/06/2025
Model: 4005966
Select a Vehicle or refer to the Vehicle Fitment Tab below to verify that this part fits your vehicle.
OVERSIZE 1
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[More Info]
Flowtech headers are the perfect combination of performance and value. Flowtech long tube headers are precision engineered using mandrel bent tubing, formed collectors and 5/16" flanges with sealing rings for a leak-free seal. All mounting hardware and gaskets are included for a simple installation. This header is coated in a high heat resistant black paint for a stealthy appearance.
Features:
  • Better Efficiency From The Engine
  • Leak Test For Max Performance
  • Mandrel-Formed Power Plenum
  • Leakproof O-Ringed Port Seals
  • Include All Mounting Hardware
  • Constructed of .049 cold roll flash mild steel tubing
  • Precision engineered for fit and performance
Breaking in an engine with ceramic coated headers WILL result in damage to the coating and will VOID all warranties. Ceramic coated headers require several heat cycles to fully cure before they will withstand extreme heat. Flowtech recommends using cast iron exhaust manifolds or old headers to break in new engines to avoid coating damage. Please call Flowtech tech service at 270-781-9741 for additional information regarding ceramic coated exhaust products. The use of header wraps can cause the header tubes to crack or rust due to excessive heat and moisture build-up. Flowtech does not recommend the use of header wraps as this will void the warranty.
Installation Notes:
Breaking in an engine with ceramic coated headers WILL result in damage to the coating and will VOID all warranties. Ceramic coated headers require several heat cycles to fully cure before they will withstand extreme heat. Flowtech recommends using cast iron exhaust manifolds or old headers to break in new engines to avoid coating damage. Please call Flowtech tech service at 270-781-9741 for additional information regarding ceramic coated exhaust products. The use of header wraps can cause the header tubes to crack or rust due to excessive heat and moisture build-up. Flowtech does not recommend the use of header wraps as this will void the warranty.

Downloads:

Download Name File Size
12100-3901flt.pdf158.01KB

Vehicle Fitment:

The Vehicle Fitment Guide is to be used as a general reference. The data has been provided by our suppliers and manufacturers and may contain errors or incorrect data. Always refer to a professional to verify correct fitment for your vehicle.
Make Model Years Engine Fitment Notes
Ford Mustang 1964 4.3L / 260 / V8
4.7L / 289 / V8		 Standard Header; Primary Tube Coll. Size 1.5x3 in.; Can Be Modified To Fit A.I.R. Fittings In Head; Will Not Fit C6 Trans.; Not Legal For Street Use;
Ford Mustang 1965 4.7L / 289 / V8 Standard Header; Primary Tube Coll. Size 1.5x3 in.; Can Be Modified To Fit A.I.R. Fittings In Head; Will Not Fit C6 Trans.; Not Legal For Street Use;
Ford Mustang 1966 4.7L / 289 / V8 Standard Header; Primary Tube Coll. Size 1.5x3 in.; Can Be Modified To Fit A.I.R. Fittings In Head; Will Not Fit C6 Trans.; Not Legal For Street Use;
Ford Mustang 1967 4.7L / 289 / V8 Standard Header; Primary Tube Coll. Size 1.5x3 in.; Can Be Modified To Fit A.I.R. Fittings In Head; Will Not Fit C6 Trans.; Not Legal For Street Use;
Ford Mustang 1968 4.7L / 289 / V8
5.0L / 302 / V8		 Standard Header; Primary Tube Coll. Size 1.5x3 in.; Can Be Modified To Fit A.I.R. Fittings In Head; Will Not Fit C6 Trans.; Not Legal For Street Use;
Ford Mustang 1969 5.0L / 302 / V8 Standard Header; Primary Tube Coll. Size 1.5x3 in.; Can Be Modified To Fit A.I.R. Fittings In Head; Will Not Fit C6 Trans.; Not Legal For Street Use;
Ford Mustang 1970 5.0L / 302 / V8 Standard Header; Primary Tube Coll. Size 1.5x3 in.; Can Be Modified To Fit A.I.R. Fittings In Head; Will Not Fit C6 Trans.; Not Legal For Street Use;
Mercury Cougar 1967 4.7L / 289 / V8 Standard Header; Primary Tube Coll. Size 1.5x3 in.; Can Be Modified To Fit A.I.R. Fittings In Head; Will Not Fit C6 Trans.; Not Legal For Street Use;
Mercury Cougar 1968 5.0L / 302 / V8
4.7L / 289 / V8		 Standard Header; Primary Tube Coll. Size 1.5x3 in.; Can Be Modified To Fit A.I.R. Fittings In Head; Will Not Fit C6 Trans.; Not Legal For Street Use;
Mercury Cougar 1970 5.0L / 302 / V8 Standard Header; Primary Tube Coll. Size 1.5x3 in.; Can Be Modified To Fit A.I.R. Fittings In Head; Will Not Fit C6 Trans.; Not Legal For Street Use;

Specifications:

Bolt Size 3/8-16 x 3/4, 3/8-16 x 3/4
CARB (California) Compliant No
Collector Diameter 3.00 inch
Emission Code 4
Engine Small Block Ford
Header Finish Black Paint
Header Style Long Tube
Part Type Exhaust Header
Primary Tube Dia. 1-1/2 inch
Product Type Headers
Proposition 65 www.P65Warnings.ca.gov
Tube Material Mild Steel

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