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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

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Flowtech Block Hugger Header - Stainless Steel

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Est. Ship Date: 09/21/2026

$561.95
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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 Dia.N/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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