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Flowtech Headers 11553FLT Headers, Upsweep, Stainless Steel, High-temperature Black Paint, Standard Flange, 2 1/4 in. Primary Tube O.D., Round Port, Chevrolet, Big Block, Pair

SKU: BIG11553FLT

Headers

Flowtech Headers 11553FLT Headers, Upsweep, Stainless Steel, High-temperature Black Paint, Standard Flange, 2 1/4 in. Primary Tube O.D., Round Port, Chevrolet, Big Block, Pair

SKU: BIG11553FLT

Headers

Sale ends in Calculating...

A$1,379.04 A$1,480.65
BACKORDER This item will be special ordered in for you. Contact us prior to purchase if you require an ETA.
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Description

IMPORTANT NOTICE: Note for Australian and European MarketsUnless otherwise stated, this product may be engineered for use in Left-Hand Drive vehicles. Steering components, pedals, shifters, linkages, instrument clusters, panhard rods/traction bars, drag links, brake boosters, brake or clutch lines, accelerator cables, heater cores, some master cylinders and adjacent parts can vary between LHD and RHD configurations. In some models compenents such as windscreen wiper arms, motors and linkages could differ in their size and orientation. Items such as floor mats & dash mats may have differences in their structure around the front row (or padding in different locations). In many cases items are identical depending on the design of the vehicle and part, but may have differing mounts, lengths or bolt patterns. Carefully review the product images and details to ensure suitability for your vehicle, or contact StreetFX support if you are unsure. Returns are not accepted for special order products.(keyword: headers)Images are supplied by the manufacturer and may be generic. While all efforts are made to provide accurate pictures, there may be differences in the actual product, such as colour, quantity, version, or included components. Please carefully review the description and specifications for details on inclusions or any variations. Some items may be sold individually or in sets, and images may occasionally depict additional products or quantities not included in your purchase. For assistance or clarification, please contact customer support.Reference Information Reference Data (Provide these details to our support team) Brand Name/s Flowtech StreetFX SKU big11553FLT SFX Item ID 5092207 Accounting SKU big-11553FLT Manufacturer SKU 11553FLT Manufacturer UPC 090127743614 Alternative References 11553FLT, BIG-11553FLT

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Data: v2 - Desc: v4.2 - Upd: 2026-10-14 03:26:46

Part Type

Headers

Data: v4.2 - Upd: 2026-10-13 20:13:03

Specifications

Headers, Upsweep, Stainless Steel, High-temperature Black Paint, Standard Flange, 2 1/4 in. Primary Tube O.D., Round Port, Chevrolet, Big Block, Pair

Flowtech headers are designed to provide optimum exhaust flow for increased horsepower, torque, fuel economy, and improved throttle response. Leak-tested for maximum performance, they feature the industry's best welds for durability and are carefully engineered for precise fit. Available for a wide range of applications, they're offered in block hugger, competition, fenderwell, lakester, long tube, mid-length, shorty, upright, and turbo styles. Varying with the application, Flowtech headers are constructed from sturdy and lightweight cold-rolled mild steel or stainless steel for increased strength and durability. All tubing is mandrel-bent to provide consistent tubing diameter for smooth flow and increased exhaust velocity. Extra-thick, machined header flanges provide a leak-free seal and maximum strength. For long-term rust and corrosion-resistance, available finishes include natural and polished stainless steel, high heat-resistant black paint, or a satin silver metallic ceramic thermal barrier coating. All mounting hardware and premium gaskets are included.

Important 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. Hooker recommends using cast iron exhaust manifolds or old headers to break in new engines to avoid coating damage. Flowtech does not recommend the use of header wraps as this will void the warranty.

Product Attributes
BrandFlowtech
Manufacturer's Part Number11553FLT
Part TypeHeaders
Product LineFlowtech Headers
UPC090127743614
Header StyleUpsweep
Header Material409 stainless steel
Primary Tube Outside Diameter (in.)2 1/4 in.
Header ColorHigh temperature black paint
Flange StyleStandard
Weld-UpNo
Cylinder Head Port ShapeRound
Collector AttachmentSlip fit
Collector Diameter (in.)4.00
Collector Reducers IncludedNo
TunedNo
Primary Tube Gauge16-gauge
Flange Thickness (in.)0.44 in.
Bolts/Studs IncludedNo
Gaskets IncludedYes
Crossover Pipe IncludedNo
Catalytic Converter(s) IncludedNo
Motor Mounts IncludedNo
Transmission Mount IncludedNo
QuantitySold as a pair.

Reference Information

Brand Name/s Flowtech
StreetFX SKU big11553FLT
SFX Item ID 5092207
Supplier Item Code 5092207
Manufacturer SKU 11553FLT
Manufacturer UPC 90127743614

Compatibility

No specific fitment data available for this part. For clarification, please contact us.

Detailed Compatibility


Application Data
MakeCHEVROLET
Beginning Year1965
Ending Year1970
Engine TypeV8
Engine FamilyChevy big block Mark IV
Engine Size6.5L/396
Power SteeringNo
Power Brakes (application)No
Air ConditioningNo
Standard Transmission Column ShiftYes
Standard Transmission Floor ShiftYes
Automatic Transmission Column ShiftYes
Automatic Transmission Floor ShiftYes
MakeCHEVROLET
Beginning Year1965
Ending Year1970
Engine TypeV8
Engine FamilyChevy big block Mark IV
Engine Size6.5L/396
Power SteeringYes
Power Brakes (application)Yes
Air ConditioningYes
Standard Transmission Column ShiftYes
Standard Transmission Floor ShiftYes
Automatic Transmission Column ShiftYes
Automatic Transmission Floor ShiftYes
MakeCHEVROLET
Beginning Year1966
Ending Year1969
Engine TypeV8
Engine FamilyChevy big block Mark IV
Engine Size7.0L/427
Power SteeringNo
Power Brakes (application)No
Air ConditioningNo
Standard Transmission Column ShiftYes
Standard Transmission Floor ShiftYes
Automatic Transmission Column ShiftYes
Automatic Transmission Floor ShiftYes

This may not be an exhaustive list of compatible vehicles. Please reach out to one of our representatives if you are unsure or do not see your vehicle here.

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