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Ships within 48 hours · Estimated delivery Jul 12 - Jul 17
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Description
Long Tube Header for 1968-74 Oldsmobile Cutlass 5.7/6.6 - Ceramic Coated - 31150FLT FlowTechOverview: 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
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 and corrosion resistant metallic ceramic thermal coating that increases exhaust velocity and reduces underhood temps for increased performance.
Features:
- Fuel Economy From The Engine
- Leak Test For Max Performance
- Ceramic Headers
- Rust And Corrosion Resistance
- Mandrel-Formed Power Plenum
- Leakproof O-Ringed Port Seals
- Include All Mounting Hardware
Application:
| Year | Make | Model | Engine | Fitment Notes |
| 1968-1969 | Oldsmobile | 442 | 6.6L V8 400 CID | See Below! |
| 1968-1974 | Oldsmobile | Cutlass | 5.7L V8 350 CID | See Below! |
| 1968 | Oldsmobile | Cutlass | 6.6L V8 400 CID | See Below! |
Fitment Notes:
- Will not fit column mounted standard or floor mounted automatics or Cutlass Supreme models.
- 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 recommends 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.
- Recommended replacement gasket - Mr. Gasket part# 453
- Must modify exhaust system to retain catalytic converters.
Specs:
| Bolt Size | 3/8-16 x 3/4 In. |
|---|---|
| Brand | Flowtech |
| Collector Diameter | 3.00 inch |
| Emission Code | 4 |
| Engine | Oldsmobile V8 |
| Header Finish | Silver Ceramic |
| Header Style | Long Tube |
| Primary Tube Dia. | 1-3/4 inch |
| Product Type | Headers |
| Tube Material | Mild Steel |
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
4.7 ★★★★★
Based on 1099 reviews
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Product Reviews
★★★★★ 5
Perfect for small senior dogs!
Size: Extra Small (Pack of 1), Color: Pink
So I actually bought this for my senior Bolonka. She has a neurological disorder that does not allow her to have hard bones or treats, plus I am trying to protect her teeth for as long as I can. This is a GREAT toy. I like to fill up the middle with yogurt or peanut butter and things she can lick instead of bite into. This is the PERFECT size for her. She likes to play with it even without a treat on the inside. She just carries it around the house , as its not heavy at all, and throws it around, it is too cute! It is not loud at all, the only noise that comes out is if shes got a ton of saliva and her teeth rub against it. I just pulled it off the packaging, washed it, and it was ready to go. It will last forever with my baby because she doesn't chew hard so I am unsure about the durability for bigger pups or dogs who are heavy chewers. I am so glad I got this for her and I would HIGHLY recommend it!
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Reviewed in the United States on February 13, 2026
★★★★★ 5
Good quality
Size: Small (Pack of 1), Color: Blue
Bought this as an upgrade for my dog's Kong that she got as a puppy and it's just as good as the smaller one. It works really goodBought this as an upgrade for my dog's Kong that she got as a puppy and it's just as good as the smaller one. It works really good
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Reviewed in the United States on June 3, 2026
★★★★★ 4
Good product misleading size.
Size: Small (Pack of 1), Color: Blue
Really disappointed about the size. It is way too small for my berniedoodle. He still likes it for play but I’m afraid he might swallow it. It’s very sturdy tho and is chew resistant. I guess I didn’t pay attention to the size. Looked big in the picture.
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Reviewed in the United States on April 18, 2026
★★★★★ 5
Must have item for dogs!!!
Size: Medium (Pack of 1), Color: Pink
The puppy kong is a must have item for every new puppy owner. Super cute!! They usually will last forever (unless you have a super chewer then you need the black one). Great value!! Keeps the puppy busy and entertained. Especially when frozen. Google and the Kong website have tons of recipes. I tend to stick with a little bit of kibble some mashed banana and peanut butter. Also, good options are jars or pouches of baby food just make sure you check the label to ensure there is nothing toxic to dogs in it. More options are kibble soaked in water or broth, pumpkin puree, green beans and carrots. I could go on forever. If you own a dog, a Kong is a must have! I always have two ready to go. And they are dishwasher safe!
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Reviewed in the United States on January 19, 2026
★★★★★ 5
Keeps her occupied!
Size: Extra Small (Pack of 1), Color: Pink
It works very well when sruffed with a healthy, soft treat. It keeps our little teething scamp busy for a while and stops her from chewing on household items including her humans!
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Reviewed in the United States on May 10, 2026