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- USA
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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
4.1 ★★★★★
Based on 578 reviews
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Product Reviews
★★★★★ 5
Great quality and easy to assemble!
Color: Blues, Size: 56 LB, Color: Blues, Size: 56 LB
I’m really happy with this dumbbell set. The stand was very easy to assemble and feels sturdy once put together. The neoprene coating on the weights is comfortable to grip and doesn’t slip, even when your hands get a little sweaty. I also love the colors—they make the set look nice in my workout space. Perfect for home workouts, compact, and easy to move around. Definitely worth it if you’re looking for a practical and stylish weight set!
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Reviewed in the United States on October 3, 2025
★★★★★ 5
Like new after years of use. Made to last.
Color: Multicolor, Size: 146 LB
Sturdy, well made, good feel. I purchased the set 2 years ago and it's still like new!
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Reviewed in the United States on June 2, 2026
★★★★★ 5
Nice weight set for taking strength off to a new start.
Color: Multicolor, Size: 12 LB
Perfect light weight set to use to rebuild my arm strength. Holder is a bonus. Now the weights will be right where I want them
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Reviewed in the United States on June 1, 2026
★★★★★ 5
Happy customer
Color: Black, Size: 32 LB, Color: Black, Size: 32 LB
I recently purchased a set of black dumbbell weights, and I couldn't be happier with my decision!
These dumbbells are solid and built to last. The weight material feels durable, and I can tell they're gonna last. These weights are perfect for all my exercises. They come in a range of sizes, allowing me to easily adjust the weight for different muscle groups. I love the sleek black finish! It not only looks stylish in my home gym but also adds a touch of professionalism to my space. The price point is excellent considering the quality and durability of these dumbbells. I've seen similar products at a much higher price, but these offer the same benefits without breaking the bank. Their design makes them easy to grip, and the smooth texture ensures I can maintain my hold even during the sweatiest workouts. Plus, they're compact and easy to store, making them perfect for home use.
Overall, these dumbbell weights check all the boxes. I highly recommend them to anyone looking to enhance their fitness journey!
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Reviewed in the United States on September 9, 2024
★★★★★ 4
Great Set
Color: Multicolor, Size: 146 LB
This is a great set of dumbbells. I was looking for the weights in this set and I wanted a nice rack to keep them off the floor. So far they feel solid and accurate and are working as expected. The reason for 4 stars and not 5 - The (2) 20 pound dumbbells shipped separate, which was fine...but everything else was in 1 box! That's 106 pounds plus the rack and packaging. The delivery guy struggled and almost dropped it, and then I had to move it from my front door step. How much more could it cost them to ship it in 3 boxes or redistribute it into 2 boxes under 100 pounds? So lucky the box didn't drop and the contents get lost or wrecked.
Otherwise it is a great set!
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Reviewed in the United States on January 18, 2025