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Exhaust› Headers, Manifolds and Components

Flowtech

Block Hugger Header Stainless Steel Block Hugger Header Small Block Chevy With D-Port Heads Tube Size 1-5/8 Inch Collector Size 2.5 Inch 304 Stainless Steel FlowTech

$608.95 $492.33 Save $116.62

SKU: F00M 11705-7FLT

In Stock
In Stock
Ships by Nov 13
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The Flowtech 11705-7FLT is a polished stainless steel Block Hugger Header designed for Small Block Chevy 265-400 engines with fast burn D-port heads, featuring 1-5/8'' primary tubes and a 2-1/2'' collector for improved exhaust flow and throttle response.
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Part #: 11705-7FLT

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
  • Ideal For Street Rods
  • Mandrel-bent tubes provide consistent tubing diameters for smooth flow and increased exhaust velocity
  • Mandrel Bent Tubes Provide Smooth Flow/Increased Exhaust Velocity
  • Heavy duty 16-gauge tubing for increased strength and durability
  • 16 Gauge Tubing Increases Strength
  • Smooth transition, 1-5/8" diameter primary tubes are used for increased exhaust flow increasing performance and improving throttle response
  • Increased Throttle Response
  • Machined 2-1/2" collector for maximum strength
  • Increased Performance
  • TIG-welded, machined 3/8" header flange for a leak-free seal and maximum strength
  • TIG Welded Collector
  • Premium aluminum header gaskets included
  • Leak Free Seal
  • This header is constructed from polished stainless steel
  • Premium Hardware

Block Hugger Header | 1.625 in. Primary Tubes | 2.5 in. Collector | Stainless Steel | For Use w/Street Rod Applications | Small Block Chevy w/D Port Heads

This product may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandFlowtech
Part NumberF00M 11705-7FLT

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Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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