Product Summary

Long Tube Header Tube Type, D-port Exhaust Port Shape

    Rebates Available

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    Key Specs

    MFG. Part #11170FLT
    Header Tube TypeLong Tube
    Exhaust Port ShapeD-port
    Flange StyleStandard
    Primary Tube Diameter1-5/8"
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    Need To Know

    Quick and Easy Returns

    Return Policy

    Flowtech Exhaust 11170FLT 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 resistant black paint for a stealthy appearance.

    • Fuel Economy From The Engine
    • Leak Test For Max Performance
    • Mandrel-Formed Power Plenum
    • Leakproof O-Ringed Port Seals
    • Include All Mounting Hardware
    • Constructed of .049 cold roll flash mild steel tubing
    • Precision engineered for fit, performance and economy

    Application

    1964 Pontiac GTO
    1964 Pontiac LeMans
    1965 Pontiac GTO
    1965 Pontiac LeMans
    1966 Pontiac GTO
    1966 Pontiac LeMans
    1967 Pontiac LeMans
    1968 Pontiac GTO
    1968 Pontiac LeMans
    1969 Pontiac GTO
    1969 Pontiac LeMans
    1970 Pontiac Firebird
    1970 Pontiac GTO
    1970 Pontiac LeMans
    1971 Pontiac Firebird
    1971 Pontiac GTO
    1971 Pontiac LeMans
    1972 Pontiac Firebird
    1972 Pontiac GTO
    1972 Pontiac LeMans
    1973 Pontiac Firebird
    1973 Pontiac Grand Am
    1973 Pontiac GTO
    1973 Pontiac LeMans
    1974 Pontiac Firebird
    1974 Pontiac Grand Am
    1974 Pontiac LeMans
    1975 Pontiac Firebird
    1975 Pontiac Grand Am
    1975 Pontiac LeMans
    1976 Pontiac Firebird
    1977 Pontiac Firebird
    1978 Pontiac Firebird
    1979 Pontiac Firebird

    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 11170FLT Specifications

    KEY SPECS
    MFG. Part #11170FLT
    BrandFlowtech Exhaust
    Header Tube TypeLong Tube
    Exhaust Port ShapeD-port
    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 Code787480111708
    Emission Code3

    Questions & Answers

    2 Questions • 2 Answers

    Are these compatible with a column shifter?

    by P.A.

    • a year ago

    1 answer

    Yes, would these particular headers fit a Buick 455 big block?

    by Adam

    • 8 years ago

    1 answer

    2 of 2 questions shown

    Fitment

    • 347 Pontiac V8

    • 370 Pontiac V8

    • 389 Pontiac V8

    • 347 Pontiac V8

    • 370 Pontiac V8

    • 389 Pontiac V8

    • 347 Pontiac V8

    • 370 Pontiac V8

    • 389 Pontiac V8

    • 389 Pontiac V8

    • 389 Pontiac V8

    • 347 Pontiac V8

    • 370 Pontiac V8

    • 389 Pontiac V8

    • 347 Pontiac V8

    • 370 Pontiac V8

    • 389 Pontiac V8

    • 389 Pontiac V8

    Customer Impersonation Script