Product Summary

Long Tube Header Tube Type, Round Exhaust Port Shape

  • Primary tube diameter is 1-5/8" and has a 3" collector
  • Headers are precision engineered using mandrel bent tubing
  • Will fit several Chevy Small Block V8 applications (see list)
  • Features formed collectors and 5/16" flanges with sealing rings for a leak-free seal
  • They are coated in a high heat and corrosion resistant metallic ceramic thermal coating that increases exhaust velocity and reduces under hood temps

Rebates Available

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Key Specs

MFG. Part #31100FLT
Header Tube TypeLong Tube
Exhaust Port ShapeRound
Flange StyleStandard
Primary Tube Diameter1-5/8"
See more specs

Need To Know

Quick and Easy Returns

Return Policy

Flowtech Exhaust 31100FLT Details

Flowtech headers are the perfect combination of performance and value. Flowtech long tube headers are precision engineered using mandrel bent tubing, formed collectors and 5/16" flanges with sealing rings for a leak-free seal. All mounting hardware and gaskets are included for a simple installation. This header is coated in a high heat and corrosion resistant metallic ceramic thermal coating that increases exhaust velocity and reduces underhood temps for increased performance.

  • Tuned-length primary tubes for street performance
  • Mandrel-bent tubing for smooth exhaust flow
  • Light weight & sturdy 16 gauge tubing
  • Mandrel-formed Power Plenum collector for low back pressure
  • Sturdy, leak-tested O-Ring port seals
  • Engineered for a precision fit
  • Designed for easy, trouble-free installation
  • Includes all mounting hardware and premium gaskets
  • Works with factory power steering and power brakes

Application

67-81 Camaro
64-77 Chevelle
69-79 Nova
70-77 Monte Carlo
65-89 Full Size
283-400
Primary Tube Size 1.625"
Collector Size 3"

Charts

Rebates

Holley October Promo 10% Off Select Parts Sale

Holley October Promo 10% Off Select Parts SaleHolleyOctoberPromo10%OffSelectPartsSale

Holley's October Promo 10% Off Select Parts Sale, running from September 28, 2026, through November 1, 2026. For a limited time, customers can save up to 10% off on select Holley parts, making it the perfect opportunity to upgrade your ride with premium Holley branded parts including Holley, Brawler, Quick Fuel, Leg Wheels, Rev Wheels, Rocket Racing, Flowtech, Edge, Racequip, Apr and Dinan. Purchases must be made between September 28, 2026, through November 1, 2026. This limited-time offer applies to qualifying Holley branded parts purchased during the promotional period. Following the promotion, these parts will revert back to standard pricing.

CARB Warning

For race/ off road use only

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

Flowtech Exhaust 31100FLT Specifications

KEY SPECS
MFG. Part #31100FLT
BrandFlowtech Exhaust
Header Tube TypeLong Tube
Exhaust Port ShapeRound
Flange StyleStandard
Primary Tube Diameter1-5/8"
Material TypeSteel
ColorSilver
Weld-UpNo
Collector Diameter3 Inch
FinishCeramic Coated
Hardware IncludedYes
Gasket(s) IncludedYes
Collector Reducers IncludedYes
Collector Reducer Exit Diameter2.5"
Collector Attachment Type3-bolt flange
GENERAL
Sold in QuantityPair
GTIN Code787480311009
Emission Code3

Ratings & Reviews

5

3 Reviews

Overall Assessment

Customers highly praise the product for its excellent fit and appealing visual aspect, emphasizing its great usability. The product is also valued for the ease of installation, demonstrating its practicality. Its material quality enhances the overall aesthetics, giving a competitive edge over similar items. Many recommend the product, regarding it superior than competitors in terms of quality and fit.

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3 reviews

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Filter by Ratings

excellant product

5.0

4 years ago

none

wisconsin

Verified

good fit nice appearance

Would Recommend

Great fit

5.0

5 years ago

T

Galva, il

Verified

Great fit , looks good

Would Recommend

Great product

5.0

5 years ago

Indio

Valdosta

Verified

Looks great, easy to install and fits perfectly

Showing 3 of 3 reviews

Questions & Answers

3 Questions • 4 Answers

Will these headers discolor from heat from the engine

by Lupineti@ptd.net

• 8 years ago

1 answer

Do these work with 1968 Camaro 327 with double hump heads and also factory air? Thanks

by Kris

• 9 years ago

2 answers

will the headers fit 1968 chevelle with angel plug heads

by Bobby

• 10 years ago

1 answer

3 of 3 questions shown

Fitment

  • 2-Piece Rear Main Chevy 283

  • 2-Piece Rear Main Chevy 283

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  • 2-Piece Rear Main Chevy 265

  • 2-Piece Rear Main Chevy 283

  • 2-Piece Rear Main Chevy 283

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • 2-Piece Rear Main Chevy 283

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 283

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 283

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • Gen 1 LG3 Small Block Chevy

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • Gen 1 LG3 Small Block Chevy

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • Gen 1 LG3 Small Block Chevy

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 283

  • Gen 1 L14 Small Block Chevy

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 283

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • 2-Piece Rear Main Chevy 400

  • Gen 1 LG3 Small Block Chevy

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 283

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • 2-Piece Rear Main Chevy 283

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • 2-Piece Rear Main Chevy 400

  • Gen 1 LG3 Small Block Chevy

  • Gen 1 DZ Small Block Chevy

  • Gen 1 DZ Small Block Chevy

  • Gen 1 L14 Small Block Chevy

  • Gen 1 L14 Small Block Chevy

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 267

  • Gen 1 LG3 Small Block Chevy

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 283

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 267

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 283

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 283

  • Gen 1 L14 Small Block Chevy

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  • Gen 1 LG3 Small Block Chevy

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  • 2-Piece Rear Main Chevy 265

  • 2-Piece Rear Main Chevy 283

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  • 2-Piece Rear Main Chevy 283

  • 2-Piece Rear Main Chevy 283

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • 2-Piece Rear Main Chevy 400

  • Gen 1 LG3 Small Block Chevy

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 267

  • 2-Piece Rear Main Chevy 350

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 267

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • Gen 1 LG3 Small Block Chevy

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • Gen 1 L14 Small Block Chevy

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • 2-Piece Rear Main Chevy 400

  • Gen 1 LG3 Small Block Chevy

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 283

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • 2-Piece Rear Main Chevy 400

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 283

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 267

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 283

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • 2-Piece Rear Main Chevy 400

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 283

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • 2-Piece Rear Main Chevy 400

  • Gen 1 LG3 Small Block Chevy

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 283

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • 2-Piece Rear Main Chevy 400

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • 2-Piece Rear Main Chevy 400

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 283

  • 2-Piece Rear Main Chevy 283

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • 2-Piece Rear Main Chevy 400

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 400

  • 2-Piece Rear Main Chevy 400

  • Gen 1 LG3 Small Block Chevy

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 283

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 400

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 283

  • 2-Piece Rear Main Chevy 400

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • 2-Piece Rear Main Chevy 400

  • Gen 1 LG3 Small Block Chevy

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 267

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 400

  • 2-Piece Rear Main Chevy 400

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 400

  • 2-Piece Rear Main Chevy 400

  • Gen 1 LG3 Small Block Chevy

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 267

  • 2-Piece Rear Main Chevy 267

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 262

  • 2-Piece Rear Main Chevy 262

  • Gen 1 LG3 Small Block Chevy

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 265

  • 2-Piece Rear Main Chevy 283

  • 2-Piece Rear Main Chevy 283

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 262

  • 2-Piece Rear Main Chevy 350

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 265

  • 2-Piece Rear Main Chevy 283

  • 2-Piece Rear Main Chevy 400

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 283

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 283

  • 2-Piece Rear Main Chevy 265

  • 2-Piece Rear Main Chevy 283

  • 2-Piece Rear Main Chevy 283

  • 2-Piece Rear Main Chevy 265

  • 2-Piece Rear Main Chevy 283

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 265

  • 2-Piece Rear Main Chevy 265

  • 2-Piece Rear Main Chevy 283

  • 2-Piece Rear Main Chevy 283

  • 2-Piece Rear Main Chevy 283

  • 2-Piece Rear Main Chevy 265

  • 2-Piece Rear Main Chevy 265

  • 2-Piece Rear Main Chevy 283

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  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 283

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 283

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 283

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • 2-Piece Rear Main Chevy 350

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  • 2-Piece Rear Main Chevy 400

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  • 2-Piece Rear Main Chevy 400

  • 2-Piece Rear Main Chevy 283

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • 2-Piece Rear Main Chevy 283

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 400

  • 2-Piece Rear Main Chevy 283

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 400

  • 2-Piece Rear Main Chevy 283

  • 2-Piece Rear Main Chevy 400

  • 2-Piece Rear Main Chevy 265

  • 2-Piece Rear Main Chevy 283

  • 2-Piece Rear Main Chevy 283

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 265

  • 2-Piece Rear Main Chevy 265

  • 2-Piece Rear Main Chevy 283

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