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Description
1964-1974 Pontiac LeMans Long Tube Headers V8 Black Paint Flowtech 11170FLTOverview: 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. Features: Fuel Economy From The Engine Leak Test For Max
Overview:
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.
Features:
- 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
Applications:
- 1970-1974 Pontiac Firebird with 5.7L V8 350 CID Engine
- 1970-1974 Pontiac Firebird with 6.6L V8 400 CID Engine
- 1971-1974 Pontiac Firebird with 7.5L V8 455 CID Engine
- 1973 Pontiac Grand Am with 5.7L V8 350 CID Engine
- 1973-1974 Pontiac Grand Am with 6.6L V8 400 CID Engine
- 1973-1974 Pontiac Grand Am with 7.5L V8 455 CID Engine
- 1964-1966 Pontiac GTO with 6.4L V8 389 CID Engine
- 1968-1973 Pontiac GTO with 6.6L V8 400 CID Engine
- 1970-1973 Pontiac GTO with 7.5L V8 455 CID Engine
- 1964-1967 Pontiac LeMans with 5.3L V8 326 CID Engine
- 1968-1974 Pontiac LeMans with 5.7L V8 350 CID Engine
- 1968-1974 Pontiac LeMans with 6.6L V8 400 CID Engine
- 1970-1974 Pontiac LeMans with 7.5L V8 455 CID Engine
Fitment Notes:
- Pontiac V8 Engines Only!
- Will not fit Firebird/Trans Ams with column shifted standard transmission.
- Must modify stock exhaust to retain catalytic converters.
- Will not fit Ram Air vehicles.
- End holes on head must be drilled and tapped to ensure proper seal.
- Breaking in an engine with ceramic coated headers WILL result in damage to the coating and will VOID all warranties. Ceramic coated headers require several heat cycles to fully cure before they will withstand extreme heat. Flowtech recommend using cast iron exhaust manifolds or old headers to break in new engines to avoid coating damage. The use of header wraps can cause the header tubes to crack or rust due to excessive heat and moisture build-up. Flowtech does not recommend the use of header wraps as this will void the warranty.
Specs:
- Bolt Size: 3/8-16 x 3/4
- Bolts Included: Yes
- Brand: Flowmaster
- CARB (California) Compliant: No
- Catalytic Converter Quantity: 0
- Collector Attachment: 3-Bolt Flange
- Collector Diameter: 3 in
- Collector Port Diameter: 3 in
- Collector Reducer Included: Yes
- Collector Reducer Outlet Diameter: 2.5 in
- Color: Black
- Cylinder Head Flange Thickness: 5/16 in
- Design: Long Tube
- Drive: 2WD
- EGT (Exhaust Gas Temperature) Port: No
- Engine: Pontiac V8
- Finish: Painted
- Flange Thickness: 5/16 in
- Gasket Or Seal Included: Yes
- Grade Type: Performance
- Header Finish: Black Paint
- Header Style: Long Tube
- Main Piping Diameter: 1-5/8 in
- Material: Mild Steel
- Mounting Hardware Included: Yes
- Oxygen Sensor Port: No
- Port Shape: Oval / D Port
- Quantity: Sold as Pair
- Sheen Level: Satin
- Tube Material: Mild Steel
- Part Number: 11170FLT
Emissions:
- 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
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.9 ★★★★★
Based on 6 reviews
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Product Reviews
★★★★★ 5
It works!
Size: 16 Fl Oz (Pack of 1), Style: Individual
A short story long---LOL---My zero turn started acting quirky-it would not run at full power and would begin to stall when put under a full load - like trying to mow some taller or thicker grass- never did stall since I would immediately kill the mower but obviously it was not right. I checked and changed the fuel filters-this one has 2 . One in the pick up line in the tank and one is inline just before the fuel pump unit. No help! So, before I dropped the big bucks to have the local farm dealer come and pick it up (at $75 per pickup and return) plus h=whatever shop charges that would result I thought "What the heck, lets give this stuff a try" I gambled $6 . I put in 5 ounces for the 5 gallons tank, and filled it with the gas I had on hand- should have been relatively fresh gas -no more than 2 weeks since pumped . Well, whatever the cause of the issue within about 15 to 30 minutes of low speed running- mostly at idle - the engine seemed to be idling smoothly as opposed to before where it surged but never died, I gave it a try at mowing. YEA!!!! full power and no bogging down - I finished mowing the yard and a part of the pasture (not yet grown up much so it is not requiring the rotary cutter YET) My only guess is perhaps a batch of either old gas or some water in the gas can or mower tank but whatever the cause it fixed it --and all for $6.
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Reviewed in the United States on April 12, 2025
★★★★★ 5
Convenient to order from Amazon
Size: 16 Fl Oz (Pack of 1), Style: Individual
Works as expected.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 25, 2026
★★★★★ 4
Good product
Size: 16 Fl Oz (Pack of 1), Style: Individual
Works well for my lawnmower. It's running better after first time using.
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Reviewed in the United States on July 13, 2025
★★★★★ 5
Fuel stabilizer
Size: 16 Fl Oz (Pack of 1), Style: Individual
Great additive
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 21, 2026
★★★★★ 5
Keeps the lawn equipment happy.
Size: 16 Fl Oz (Pack of 1), Style: Individual
I use this product in my lawn equipment to keep the carburetors clean.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 23, 2025