Product Summary

Long Tube Header Tube Type, Round Exhaust Port Shape

  • Made from light weight & sturdy 16 gauge tubing
  • Includes mandrel-bent tubing for smooth exhaust flow
  • Features tuned-length primary tubes for street performance
  • It is mandrel-formed Power Plenum collector for low back pressure
  • These header will fir a variety of vehicle applications (see list)

Rebates Available

See rebate details
See more details

Key Specs

MFG. Part #11100FLT
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 11100FLT 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 3/8" 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 resistant black paint for a stealthy appearance.

  • Tuned-length primary tubes for street performance
  • Mandrel-bent tubing for smooth exhaust flow
  • Lightweight & 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

Vehicles:

  • 1967-81 Camaro
    • Will NOT fit 1967-69 Camaro w/ Air Conditioning
  • 1965-74 Chevy Full-Size Car
    • Does NOT fit with manual transmission on late model passenger wagons
  • 1964-73 Chevelle
  • 1964-74 El Camino/Malibu
  • 1964-72 Skylark
  • 1968-74 ChevyII/Nova
  • 1970-74 Monte Carlo
    • Does NOT fit with manual transmission on Monte Carlol

Engine/Exhaust Specs:

  • 283-400 Chevy Small Block Gen I
    • Will NOT fit with angle plug heads or raised port heads
    • Factory motor mounts must be used for proper engine placement
    • Will ONLY fit vehicle applications listed provided they have a Chevy Small Block Gen I engine
  • Primary Tube Size 1.625"
  • Collector Size 3" - reduced to 2-1/2" exhaust tubing systems

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 11100FLT Specifications

KEY SPECS
MFG. Part #11100FLT
BrandFlowtech Exhaust
Header Tube TypeLong Tube
Exhaust Port ShapeRound
Flange StyleStandard
Primary Tube Diameter1-5/8"
Material TypeSteel
ColorBlack
Weld-UpNo
Collector Diameter3 Inch
FinishPainted
Hardware IncludedYes
Gasket(s) IncludedYes
Collector Reducers IncludedYes
Collector Reducer Exit Diameter2.5"
Collector Attachment Type3-bolt flange
GENERAL
Sold in QuantityPair
GTIN Code787480111005
Emission Code3

Ratings & Reviews

4.9

7 Reviews

Overall Assessment

Customers appreciate the product for its fitting and practicality, noting it works well with specific models like Sbc 327 and Weiand 177 blower. Users admire how seamlessly it integrates, even requiring minor adjustments to align with stock steering boxes. The product's material quality is mentioned, displaying slight rust covered with a light oil, which is deemed removable. Customers praise its look and performance, remarking on the good sound it produces once installed. The consensus is that they would recommend and repurchase the product, emphasizing its superiority in comparison to its competitors.

4.9

7 reviews

5

6

4

1

3

0

2

0

1

0

Filter by Ratings

Would buy again

5.0

a year ago

Joe

Pa.

Verified

Headers fit like a glove on 68 Camaro sbc with power steering,no ac.

Would Recommend

Yes

5.0

a year ago

Skinner

Allegan, Michigan

Verified

Makes my car sound good

Would Recommend

yes i would

5.0

2 years ago

Ron

Dittmer, Mo

Verified

Everything was with it and fit very well

Would Recommend

I would buy this again

4.0

3 years ago

Mike

Blackduck Minnesota

Verified

Installing on Sbc 327. Like the price and shipping. Light rust on headers though they seem to have a light oil on them too. Should clean up pretty easy.

Would Recommend

Yes i would buy this again

5.0

3 years ago

Kirk

S Jordan, Utah

Verified

Had to make a dimple on one tube to clear stock steering box, Great fit and looks great too.

Would Recommend

I will buy this product again

5.0

5 years ago

70nova

San Diego California

Verified

So far it seems they keep up well with my Weiand 177 blower. Sounds pretty good.

Would Recommend

Yes

5.0

7 years ago

Jeff

Minnesota

Verified

Used them on my 77 Nova

Would Recommend

Showing 7 of 7 reviews

Questions & Answers

4 Questions • 5 Answers

Do these headers work with Chevy Vortec Heads with 062 casting number?

by Craig

• 8 years ago

2 answers

Will these fit a 67 Camaro 327 with power steering and A/C?

by Josh

• 8 years ago

1 answer

What size are collector adaptor? What size exhaust pipe?

by Scott

• 9 years ago

1 answer

will these headers fit a 67 chevelle with standard transmission

by wdfritzs

• 10 years ago

1 answer

4 of 4 questions shown

Fitment

  • 2-Piece Rear Main Chevy 283

  • 2-Piece Rear Main Chevy 283

  • 2-Piece Rear Main Chevy 283

  • 2-Piece Rear Main Chevy 283

  • 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 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

  • 2-Piece Rear Main Chevy 283

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • 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 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

  • 2-Piece Rear Main Chevy 283

  • 2-Piece Rear Main Chevy 283

  • 2-Piece Rear Main Chevy 283

  • 2-Piece Rear Main Chevy 283

  • 2-Piece Rear Main Chevy 283

  • 2-Piece Rear Main Chevy 283

  • 2-Piece Rear Main Chevy 283

  • 2-Piece Rear Main Chevy 283

  • 2-Piece Rear Main Chevy 283

  • 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

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 400

  • 2-Piece Rear Main Chevy 400

  • 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

  • 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

  • 2-Piece Rear Main Chevy 283

  • 2-Piece Rear Main Chevy 283

  • 2-Piece Rear Main Chevy 283

  • 2-Piece Rear Main Chevy 283

Customer Impersonation Script