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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
4.6 ★★★★★
Based on 10 reviews
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Product Reviews
★★★★★ 5
UGH SO GOOD!!!
Format: Paperback
Such a good book! The way the story is written and how the characters are portrayed leaves you wanting more! A tad bit of a slow burn but so so good and worth the wait! Personally I bought both the book and audio book because I couldn't put it down! This book had me (A man) kicking my feet like a little girl and holding back tears throughout the story. I just love love and this story is just so beautifully written!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 15, 2026
★★★★★ 3
Slow burn with a sprinkle of fantasy.
Format: Kindle
It was alright. Written well. Story was decent. But it just lacked something.
It's the slowest burn I've ever read, which is fine.
I felt like the knight (main character) was kind of weak and whiney… And I expected the strength of a knight!
The first chapter is filled with a lot of background information, but then it's like the story doesn't really reference it again. I would have liked a bit more information that first chapter before just heading right into the story in chapter 2.
Things could have been explained more in general. There could have been a lot more detail and explanation abiut the fantasy side of the book. It was just like a straight romance with a sprinkle of fantasy.
Overall, it was decent, but I probably wouldn't recommend it to someone unless they asked specifically for a slow burn with a little bit of fantasy.
I received an advance review copy for free, and I am leaving this review voluntarily.
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Reviewed in the United States on November 9, 2024
★★★★★ 4
A Forbidden Romance With Teeth
Format: Paperback
First off: I loved the couple. Della, our acting princess, and her sharp wit and determination to survive were a refreshing change from the damsel type princess. Galeon was a woman of honour and yet so head over heels with the fake princess that she can't keep away.
Birch does a great job of building a magical world and drawing you into it so that you kept turning pages until the end. And that page-turning was also spurred by the slow burn will-they-won't-they romance between the heroines who had much to lose if they crossed the line. I've purchased all three novels and will review Her Blushing Hero just as soon as I've finished.
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Reviewed in the United States on March 11, 2026
★★★★★ 5
AMAZINGGGGG
Format: Kindle
My first sapphic read and i think I’ll forever be attached to her writing! Already finished the consecutive two books in the series and I’m back to rereading them all! Such a great author to draw up such vivid pictures through words, especially the spicy parts! Great slow burn, so much action and lesbians are normalized in this world??? I loveeee it! Thank you Ms. Mariah for giving your readers a beautiful place to escape! Can hardly wait for spring when she releases the 4th book 😍
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Reviewed in the United States on February 21, 2026
★★★★★ 1
Toxic fumes!
Format: Hardcover
Be careful! Book stank, even after a few days with fumes that felt toxic and probably were. Returned
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 5, 2025