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Flowtech Block Hugger Header - Stainless Steel

Part # 11705-7FLT Be the first to write a review

Block Hugger Header: Small Block Chevy with D-Port Heads, Tube Size 1-5/8", Collector Size 2.5", 304 Stainless Steel

Flowtech Block Hugger Header - Stainless Steel

Estimated Ship Date: 07/13/2026
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$540.95
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4

Emissions

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.

    See Emissions Details
Flowtech Headers are the perfect combination of quality and value. These block hugger headers use an oval port design that is compatible with Chevy Fast Burn D-port heads. This header is constructed from polished 304 stainless steel.

Features:

  • Block hugger design fits the most popular hot rod applications with small block Chevy motors using the fast burn D-port heads
  • Mandrel-bent tubes provide consistent tubing diameters for smooth flow and increased exhaust velocity
  • Heavy duty 16-gauge tubing for increased strength and durability
  • Smooth transition, 1-5/8” diameter primary tubes are used for increased exhaust flow increasing performance and improving throttle response
  • Machined 2-1/2” collector for maximum strength
  • TIG-welded, machined 3/8” header flange for a leak-free seal and maximum strength
  • Premium aluminum header gaskets included
  • This header is constructed from polished stainless steel

About Flowtech Exhaust

Flowtech provides high-quality performance exhaust systems at a great value. Explore our lineup of headers, mufflers, and exhaust systems at our official retailer, Holley.com!​

Air Injection TubesNo
Bolt Size3/8-16 x 3/4 IN
Bolts IncludedYes
Brand Flowtech Exhaust
California Proposition 65Yes
CARB (California) CompliantNo
CategoryExhaust
Collector Attachment3-Bolt Flange
Ball and Socket Flange
Collector Diameter2.50 IN
Collector Port Diameter2.50 IN
Collector Reducer IncludedNo
Collector Reducer Outlet DiameterN/A
ColorSilver
DesignBlock Hugger
Drive2WD
4WD
EGT PortNo
Emission Code4
EngineChevrolet Small Block Gen I
FinishPolished
Flange Thickness0.375 IN
3/8 IN
Gasket Or Seal IncludedYes
Grade TypePerformance
Header SeriesBlock Hugger
Header StyleBlock Hugger
Material304 Stainless Steel
Mounting Hardware IncludedYes
Oxygen Sensor PortNo
Part TypeExhaust Header
Port ShapeD-Port
Primary Tubing Diameter1 5/8 IN
1.625 IN
Product TypeHeaders
QuantitySold as a Pair
Sheen LevelHigh Gloss
Sub CategoryExhaust Manifolds
Tube Wall Thickness16 GU
UPC090127690796
Part Number11705-7FLT
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

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