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FlowTech Tight Fit Block Hugger Header 11706-1FLT

FlowTech Tight Fit Block Hugger Header 11706-1FLT
FlowTech Tight Fit Block Hugger Header 11706-1FLTFlowTech Tight Fit Block Hugger Header 11706-1FLTFlowTech Tight Fit Block Hugger Header 11706-1FLTFlowTech Tight Fit Block Hugger Header 11706-1FLTFlowTech Tight Fit Block Hugger Header 11706-1FLT
$693.99 ea
NEWARRIVING SOONEstimated Ship Date 10/16/2023 (If Ordered Today)41 available from HOLLEY PERFORMANCE PRODUCTS as of 09/23/2023
Model: 4005960
Supplier has not provided any fitment data for this product.
Flowtech Headers are the perfect combination of quality and value. This block hugger header fits all popular hot rods with the popular Chevy LS motors. This header is coated with metallic ceramic coating for maximum performance and corrosion resistance with a stylish look.
  • Ideal For Street Rods
  • Mandrel Bent Tubes Provide Smooth Flow/Increased Exhaust Velocity
  • 16 Gauge Tubing Increases Strength
  • Increases Performance
  • Improves Throttle Response
  • TIG Welded
  • Leak Free Seal
  • Premium Hardware/Gaskets
  • Adapter Tubes Supplied For Easy Connection
Holley Performance Emission Code 4: This part is legal for sale or use on Racing Use Only Vehicles. The following vehicles are considered Racing Use Only Vehicles: Racing Use Only Vehicles are vehicles that are used exclusively for competition that are not registered and that may never be used on the street. WARNING: It is against the law to install this part on an Emissions Controlled Vehicle
About FlowTech

Flowtech Performance Exhaust was founded in 1994, by exhaust market expert Gary Biggs, with the mission of delivering high quality performance exhaust at a great value. The mission was successful and in less than two decades Flowtech became the leader in value priced exhaust systems.

Flowtech cornered its place in the market with aggressive and memorable product names such as Raptor™, Terminator™, Afterburner™ and Warlock™. Flowtech even revived some names from back in the day like Purple Hornies™.

Flowtech made its mark with simple yet effective improvements like slotted port flanges giving added wiggle room during header installation. They dimpled their tubes at the port to make more room for the header bolts and they parallel ground their flanges to assure a tight seal. Flowtech innovations include their unique Afterburner headers which separated the odd firing cylinders with a velocity tube to improve scavenging. Their patented Warlock bypass muffler won the SEMA best new product award for its revolutionary open or closed design in 1996.

When Flowtech became part of Holley Performance Products in 1999, the company continued to focus on value, with an emphasis on late model cars and trucks. Headers and exhaust systems were developed for Mustangs, Camaros, and all types of full size trucks - including diesels. The same innovation continues today with the addition of universal X-pipe kits and X-pipe kits with built in cut-outs. Continuous product updates and improvements to manufacturing processes will keep Flowtech the leader in value priced exhaust systems. We hope you enjoy your Flowtech product as much as we enjoy building it!


Download Name File Size


Application Automotive
Coated Finish Metallic Ceramic
Collector Diameter 2.500 in.
Collector Tube Size 2.500 in.
Emission Code 4
Engine GM Small Block Gen III/IV (LS Based)
Engine Make/Size Chevy LS Series
Flange Length 0.375 in.
Flange Size 3/8 Inch
Head Style Block Hugger
Header Finish Silver Ceramic
Header Style Block Hugger
Material Mild Steel
Part Type Exhaust Header
Port Shape Same As Port/Can Be Matched
Primary Tube Dia. 1-5/8 inch
Primary Tube Diameter 1.625 in.
Tube Diameter 1.625 in.
Tube Direction Down Swept
Tube Material Mild Steel
WARNING CA Proposition 65 WARNING: Cancer and Reproductive Harm


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