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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.
1968-1974 Oldsmobile Cutlass (not Supreme)/442 350-403ci Standard Headers Primary Tube Collector Size 1.75 in. x 3 in.
HDR 68-74 OLDSMOBILE 350-403
HDR 68-74OLD
Recommended replacement gasket – Mr. Gasket part# 453
Must modify exhaust system to retain catalytic converters.
| Brand |
FlowTech |
|---|---|
| Part Number (MPN) |
11150FLT |
| SKU |
11150FLT |
| UPC / GTIN |
090127636558 / 00090127636558 |
| Condition |
New |
| UPC |
00787480111500 |
| Bolt size |
3/8-16 x 3/4 |
| CARB (California) Compliant |
No |
| Category |
Exhaust |
| Collector Attachment |
3-Bolt Flange |
| Collector Diameter |
3.00 |
| Collector Port Diameter |
3.00 |
| Design |
Long Tube |
| EGT Port |
No |
| Emission Code |
4 |
| Engine |
Oldsmobile V8 |
| Finish |
Painted |
| Flange Thickness |
5/16″ |
| Gasket Or Seal Included |
Yes |
| Grade Type |
Performance |
| Header Finish |
Black Paint |
| Header Style |
Long Tube |
| Material |
Mild Steel |
| Mounting Hardware Included |
Yes |
| Oxygen Sensor Port |
No |
| part type |
Exhaust Header |
| Port Shape |
Rectangle |
| Primary Tube Dia. |
1-3/4 inch |
| Primary Tubing Diameter |
1.750 |
| Product Type |
Headers |
| Sheen Level |
Satin |
| Sub Category |
Exhaust Manifolds |
| Tube Material |
Mild Steel |
| Tube Wall Thickness |
18 |
| Warning |
California Proposition 65 |
| Year |
1974 |
| Make |
Oldsmobile |
| Model |
Cutlass |
| Body & Trim |
Base |
| Engine & Transmission |
5.7L V8 – Gas |
Vehicle Fitment
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