Product Summary

Long Tube Header Tube Type, Round Exhaust Port Shape

  • All mounting hardware and gaskets are included for a simple installation
  • These long tube headers are precision engineered using mandrel bent tubing
  • Header is coated in a high heat resistant black paint for a stealthy appearance
  • Features formed collectors and 5/16" flanges with sealing rings for a leak-free seal
  • Specially designed to fit the 63-87 Chevy/GMC pick-up 1/2 & 3/4 & 1-Ton pick-up 4WD 292-230-250 6 Cyl.

Rebates Available

See rebate details
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Key Specs

MFG. Part #11510FLT
Header Tube TypeLong Tube
Exhaust Port ShapeRound
Flange StyleStandard
Primary Tube Diameter1-1/2"
See more specs

Need To Know

Quick and Easy Returns

Return Policy

Flowtech Exhaust 11510FLT 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 roll flash mild steel tubing
  • Precision engineered for fit, performance and economy

Application

63-87 Chevy/GMC pick-up 1/2 & 3/4 & 1-Ton pick-up 4WD 292-230-250 6 Cyl.
Tube Size 1.5"
Collector Size 2.5"

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 11510FLT Specifications

KEY SPECS
MFG. Part #11510FLT
BrandFlowtech Exhaust
Header Tube TypeLong Tube
Exhaust Port ShapeRound
Flange StyleStandard
Primary Tube Diameter1-1/2"
Material TypeSteel
ColorBlack
Weld-UpNo
Collector Diameter2-1/2 Inch
FinishPainted
Hardware IncludedYes
Gasket(s) IncludedYes
Collector Reducers IncludedYes
Collector Reducer Exit Diameter2.25"
Collector Attachment Type3-bolt flange
GENERAL
Sold in QuantityPair
GTIN Code090127588772
NotesHAS HEAT PLATE, 3 BOLT HAS HEAT PLATE GASKET
Flange Thickness0.3125"
Overall Height27.25"
Emission Code3
Header Dimension A11.25"
Header Dimension B26."
Header Dimension C39"

Ratings & Reviews

4.3

15 Reviews

Overall Assessment

Customers appreciate the product for its affordability and aesthetic appeal. The product was commended for seeming well-built and delivering on expectations. Despite some users needing to conduct alterations, they have praised the product's overall fit and performance after installation. Unfortunately, fitment problems with certain vehicle models were mentioned frequently, necessitating modifications; yet, these issues weren't a deal-breaker for most. Notably, the headers' great look and superior sound when mounted on the engine were highlighted. Our product has generally outperformed alternatives, further validated by customers choosing us over competitors for our quality.

4.3

15 reviews

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Most Liked Positive Review

4.0

I like it but had some fittment quality issues

I like em for the price but contacted the offy intake a few placed just a tad and had to hammer down on a tube or two to clearance. The flange weld on one of the headers was slightly off and I had to clearance that as well for the bolt to thread into the head. Fit ok in my 53 chevy 3100 but do hang a few inches lower than the bellhousing crossmember.

Most Liked Negative Review

3.0

On the fence.

headers hit stock intake manifolds so I had to change out manifold and modify clutch linkage support slightly.

Filter by Ratings

I would buy again

3.0

2 years ago

DS

Ohio

Verified

Will need modification to fit. Some flange grinding for clearance to intake

Would Recommend

Great service

5.0

2 years ago

Raven

Montreal Quebec

Verified

Yet to see how it fits….

Would Recommend

I like it but had some fittment quality issues

4.0

2 years ago

Andrew

Indy, IN

Verified

I like em for the price but contacted the offy intake a few placed just a tad and had to hammer down on a tube or two to clearance. The flange weld on one of the headers was slightly off and I had to clearance that as well for the bolt to thread into the head. Fit ok in my 53 chevy 3100 but do hang a few inches lower than the bellhousing crossmember.

Would Recommend

I would buy this product and order from this company again

5.0

2 years ago

Sapo

San marcos tx.

The product feels well built

Would Recommend

Long tube

5.0

4 years ago

Ben

Tri-cities WA

Verified

They will work after I cut them down to fit my 65 Chevy 2 wish they made the right ones lol

No regret

5.0

4 years ago

Don

Sperry iowa

Verified

Just what I was looking for. Got great help from your tech people. 2 thumbs up

Would Recommend

Great fitment, great product.

5.0

6 years ago

Brandon

Rancho Cordova, CA

Verified

The look is great, the fitment is almost perfect slight modification is needed if using a stock manifold to the second exhaust tube or slight grinding of the stock intake. The issue is not there if using aftermarket intake. My motor is not running so I can't comment on the sound quality but they look awesome mounted on the engine.

Would Recommend

Would not recommend these headers

2.0

6 years ago

KC

IA

Very Poor Fitment

Would Not Recommend

Delivered fast

5.0

6 years ago

Jon

Bismarck nd

Verified

Havent installed yet

Would Recommend

not bad but not many choices

4.0

8 years ago

blockhead

sioux city ia

Verified

nice quality, fit good on engine but dont clear aftermarket intake at all you cant use a stock exhaust with 4 barrel intake and the headers dont fit either

Would Recommend

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Showing 10 of 15 reviews

Questions & Answers

10 Questions • 11 Answers

What is the measurement from the top of the exhaust flange to the top of the collectors? I'm trying to ascertain if these headers will clear the clutch fork on a 1951 chevy pickup with a 292 from a later year chevy pickup. Thanks, Jon

by Jon

• 3 years ago

1 answer

Would these headers fit a 1968 Chevrolet Nova II inline 6.

by Edgar

• 7 years ago

1 answer

Will these work with the stock intake?

by Casey

• 7 years ago

2 answers

I have a 1962 GMC K1000 with an engine swap of a I292 from a 1976 Chevy. Would this header fit? If not, can you recommend one that would? Thanks

by Conk

• 7 years ago

1 answer

Will it fit with a stock 69 c-10 250 intake and clear clutch linkage

by Gasser

• 7 years ago

1 answer

will this fit a 1954 chevy 235?

by Carter

• 9 years ago

1 answer

I have a 1958 235 stovebolt engine will these fit

by 58chevy

• 9 years ago

1 answer

I think I already know the answer to this question already but would like to know for sure. I have a 1962 Chevy II with a 1969 230 inline 6. I am looking for headers that I can run on this motor. I am concerned that these headers being truck headers will be too long to run and create ground clearance issues. I do understand that I may have other fitment issues as well. Is there any hope that these headers could work in my application pending a few other modifications? Thanks Cole

by Cole

• 10 years ago

1 answer

I have a Chevy 250 inline 6. Will these fit my motor? Thanks Chris

by Chris

• 10 years ago

1 answer

Do these come with collector flanges?

by Coot

• 10 years ago

1 answer

10 of 10 questions shown

Fitment

  • 250 Chevy Turbo-Thrift 6 I6

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  • Chevy Inline 6 250 L22

  • Chevy Inline 6 250 LD4

  • Chevy Inline 6 250 LE3

  • 230 Chevy Turbo-Thrift 6 I6

  • 292 Chevy Turbo-Thrift 6 I6

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  • 230 Chevy Turbo-Thrift 6 I6

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