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Flowtech Rams Horn Exhaust Manifolds - Ceramic Coated

Small Block Chevy Rams Horn Exhaust Manifolds; 1-5/8" primary diameter; 2-1/4" Collector; Silver Metallic Ceramic Coated

PART# 11704-1FLT

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$399.00   Suggested Retail
$358.95   Your Price
Estimated shipping date: 01/29/2021
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Flowtech exhaust manifolds are the perfect combination of quality and value. These Rams horn exhaust manifolds fit all popular hot rods with the popular small block Chevy engine.


  • Tight fit block hugger design for popular hot rod and street rods powered by the popular small block Chevy motors
  • Cast iron construction styled in the vintage “Rams Horn” design for maximum engine clearance and maximum strength
  • Smooth transition, 1-5/8” diameter primaries are used for increased exhaust flow increasing performance and improving throttle response
  • 3/8” thick 2-1/4” collector for maximum strength
  • Thick manifold flange pads for a leak-free seal and maximum strength
  • Premium aluminum manifold gaskets and collector hardware is included
  • This manifold is coated in metallic ceramic coating for maximum performance and reduced skin temperatures
  • Sold as a pair


Collector Diameter2.25 inch
Emission Code4
EngineChevrolet Small Block
Flange StyleSquare Port
Gaskets IncludedYes
Hardware IncludedYes
Header FinishSilver Ceramic
Header StyleRam Horn
Pack QtyPair
Primary Tube Dia.1-5/8 inch
Product TypeManifold
Tube Diameter1.625"
Part Number11704-1FLT



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

Tech Resources

Manifold to head bolts not included. Header Dimensions:

Width of Header at widest point from exhaust flange- 3.823"
Height of Header from highest to lowest point - 7.13"
Length of Header from leading edge to trailing edge - 18.623"
Cylinder Head surface to outside point - 3.52"
Bolt center to top of manifold - 3.51"
Manifold bolt center to bottom of collector - 5.50"
Collector mounting hole center to center- 3.031"
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