Chevy/GMC 350 (5.7L) & 305 (5.0L) SBC Long Tube Headers for 1988-1997 C/K Trucks
Replace restrictive or damaged factory manifolds with a stainless long tube setup built for a deeper V8 tone and a cleaner exhaust path. This Flashark header kit fits the listed 1988–1997 Chevrolet and GMC C/K truck, Blazer, and Tahoe applications equipped with a 5.0L 305 or 5.7L 350 small block Chevy V8.
These Chevy 350 long tube headers are intended for truck-specific TBI and Vortec applications shown below. Long tubes offer a more performance-oriented layout than factory cast manifolds, but they also require careful checks around the collectors, steering shaft, front driveline, spark plug wires, and existing exhaust system.
Specifications
| Brand | Flashark |
|---|---|
| SKU | FLES08255 |
| Model | EH28022 |
| Product Type | Long tube exhaust headers |
| Engine Application | 5.0L 305 / 5.7L 350 Small Block Chevy V8 |
| Material | T304 stainless steel |
| Finish | Mirror-polished stainless finish |
| Primary Tube / Inlet Size | 1.5 in. |
| Collector / Outlet Size | 3.0 in. |
| Collector Flange | 3-bolt flange |
| O₂ Sensor Location | One listed O₂ sensor location |
Key Features
- Long tube layout designed to reduce restriction compared with many factory cast-manifold arrangements.
- Built for the listed Chevy and GMC truck applications using 305 or 350 small block V8 engines.
- T304 stainless steel construction with a polished finish.
- 1.5-inch primary tubes and 3-inch collectors with 3-bolt flanges.
- Provides a stronger, deeper V8 exhaust character when matched with the rest of the exhaust system.
- Includes reducers, bolts, and metal gaskets for the listed kit.
Built for Better Flow and Sound
Factory cast manifolds are durable and compact, but their passages can limit exhaust movement as a small block build becomes more performance focused. The longer primary tubes in this kit give exhaust pulses a smoother path toward the collectors, supporting sharper throttle response, a deeper exhaust note, and better breathing through the upper rpm range.
The final result depends on engine condition, camshaft, fuel and ignition setup, exhaust diameter, catalytic converter arrangement, mufflers, and installation quality. Headers work as part of the complete exhaust system rather than as an isolated power upgrade.
| Part | Best Suited For | Main Consideration |
|---|---|---|
| Factory cast manifolds | Factory-style replacement and quieter operation | More restrictive exhaust path |
| Shorty headers | Compact packaging and simpler exhaust connection | Less of the long-primary layout used by full-length headers |
| Long tube headers | Stronger sound and performance-oriented 305/350 SBC builds | More clearance checks and possible exhaust fabrication |
How These Headers Fit the SBC Truck Exhaust Path
These headers are built for the listed Chevrolet and GMC C/K trucks, Blazer, and Tahoe applications. While many vehicles use a 350 small block Chevy engine, header clearance and collector placement still depend on the chassis, model year, and drivetrain.
The listed applications include both TBI-era trucks and select Vortec configurations. Match your truck’s year, model, 5.0L or 5.7L engine, and 2WD or 4WD layout to the Fitment table before ordering.
What Is Included
- Long tube header assemblies
- Collector reducers
- Installation bolts
- Metal gaskets
Mechanic’s Note: Mock up both header assemblies before final tightening. Check collector angle, steering-shaft clearance, front-driveline clearance on listed K-series trucks, and spark-plug-wire routing. Keep plug wires and nearby hoses away from hot primary tubes, and recheck fastener torque after the first heat cycles.
Who These Headers Are Best For
- Owners of a vehicle specifically listed in the Fitment table.
- 305 or 350 SBC truck builds seeking a deeper exhaust tone and less restrictive header layout.
- Projects where the installer can inspect collector alignment and complete any required downstream exhaust work.
- Stock or modified trucks with enough clearance around the steering shaft, frame, driveline, and existing exhaust.
When to Choose a Different Header
- The vehicle’s model year, engine, or drivetrain is not listed in the Fitment table.
- The vehicle uses a different chassis simply fitted with a 305 or 350 SBC engine.
- The truck has an engine swap, major suspension-height change, or custom exhaust without measured clearance.
- The goal is a compact factory-style connection with minimal collector or downstream exhaust work; a shorty header may be a better match.
O₂ Sensor, Exhaust Connection & Installation Notes
The kit specifications list one O₂ sensor location and 3-inch collectors with 3-bolt flanges. Match the truck’s sensor routing and downstream exhaust layout before installation. Long tube collector placement can differ from the factory manifold outlet position, so cutting, welding, reducer alignment, or fabrication may be needed to connect the remaining exhaust system.
A professional installation is recommended when the vehicle has factory emissions equipment, a custom exhaust, limited steering clearance, or a 4WD front driveline. Repairing exhaust leaks at the cylinder-head flange and collectors is important for sound, drivability, and reliable sensor readings.
Emissions & Street Use Notice
Long tube headers can change factory exhaust routing, catalytic-converter placement, O₂ sensor location, and other emissions-related equipment. Requirements vary by location and vehicle use. Check the rules that apply to your vehicle before installation on an emissions-controlled street vehicle.
Shipping & Returns
Free U.S. Shipping: Orders are typically processed within 1–2 business days and delivered within 7–9 business days. Additional charges may apply to remote areas.
30-Day Returns: Unopened and unused items in their original packaging may be returned within 30 days of receipt. Return shipping is covered for verified quality issues.
Worry-Free Delivery: Optional protection against eligible loss, theft, delay, or transit damage is available at checkout.
Fitment & Compatibility
⚠️ CRITICAL FITMENT RULES (MUST READ FIRST)
Use this table as the starting point before ordering. These headers are intended for select Chevy/GMC 5.0L 305 and 5.7L 350 SBC truck applications. For swapped trucks, lifted trucks, lowered trucks, custom exhausts, or vehicles with previous exhaust modifications, additional fabrication may be required.
✅ Verified Fitment
| Brand | Model | Year Range | Full Compatible Specs |
|---|---|---|---|
| Chevrolet | C1500 | 1988-1996 | 5.0L/5.7L SBC Vortec/TBI Engine, 2WD |
| Chevrolet | C2500 | 1988-1995 | 5.0L/5.7L SBC Vortec/TBI Engine, 2WD |
| Chevrolet | K1500 | 1988-1995 | 5.0L/5.7L SBC Vortec/TBI Engine, 4WD |
| Chevrolet | K2500 | 1988-1995 | 5.0L/5.7L SBC Vortec/TBI Engine, 4WD |
| Chevrolet | Blazer | 1992-1994 | 5.0L/5.7L SBC Vortec/TBI Engine |
| Chevrolet | Tahoe | 1995 | 5.0L/5.7L SBC Vortec/TBI Engine |
| GMC | C1500 | 1988-1997 | 5.0L/5.7L SBC Vortec/TBI Engine, 2WD |
| GMC | C2500 | 1988-1995 | 5.0L/5.7L SBC Vortec/TBI Engine, 2WD |
| GMC | K1500 | 1988-1995 | 5.0L/5.7L SBC Vortec/TBI Engine, 4WD |
| GMC | K2500 | 1988-1995 | 5.0L/5.7L SBC Vortec/TBI Engine, 4WD |
Before You Buy: Confirm Your Fitment
- Confirm your truck is a compatible 1988-1997 Chevy/GMC application listed in the fitment table.
- Confirm your engine is a 5.0L 305 or 5.7L 350 small block Chevy V8.
- Confirm your vehicle model, including C1500, C2500, K1500, K2500, Tahoe, Blazer, or Yukon where listed.
- Confirm whether your truck uses a TBI or Vortec-style setup based on your model year and engine configuration.
- For engine-swapped or heavily modified trucks, please verify compatibility before ordering.
Chevy/GMC 305 & 350 Long Tube Header FAQs
Q1: Will these headers fit a Chevy 350 small block?
A1: They fit the listed Chevrolet and GMC truck applications equipped with a 5.7L 350 SBC. A shared SBC engine family does not make the headers universal across other chassis.
Q2: Will the same headers fit a 5.0L 305?
A2: Yes. The Fitment table includes listed 5.0L 305 SBC truck applications as well as listed 5.7L 350 applications.
Q3: Are these long tube or shorty headers?
A3: These are long tube headers. They use longer primary tubes and require more collector and chassis-clearance checking than a typical shorty design.
Q4: Do they fit both 2WD and 4WD trucks?
A4: The table includes C-series 2WD trucks and specific K1500 and K2500 4WD applications. It does not establish fitment for every 4WD Chevy or GMC truck.
Q5: Will they fit a 1996 Chevy C1500 5.7L Vortec?
A5: Chevrolet C1500 applications are listed through 1996. Match the engine, 2WD drivetrain, O₂ sensor routing, and existing exhaust layout before installation.
Q6: Will they fit a 1997 GMC C1500?
A6: GMC C1500 applications are listed through 1997. The truck must match the listed 5.0L or 5.7L SBC and 2WD configuration.
Q7: Will they fit a 1998 truck or another vehicle with an SBC 350?
A7: No 1998 application is listed. These headers should not be selected for another chassis solely because it uses a 305 or 350 small block Chevy engine.
Q8: How will the exhaust sound change?
A8: Long tube headers generally create a deeper, stronger V8 character than factory cast manifolds. Mufflers, catalytic converters, pipe diameter, crossover layout, and exhaust exits determine the final volume and tone.
Q9: How much horsepower will the headers add?
A9: There is no single gain that applies to every 305 or 350 build. Results depend on engine condition, camshaft, fuel and ignition setup, cylinder heads, exhaust configuration, and installation quality.
Q10: Is a tune required?
A10: The answer depends on the truck’s TBI or Vortec configuration and whether installation changes the O₂ sensor, catalytic converters, or other emissions equipment. Modified fuel, ignition, or emissions configurations should be evaluated by a technician familiar with the vehicle.
Q11: Will the headers connect directly to the factory exhaust?
A11: The kit uses 3-inch collectors with 3-bolt flanges. Long tube collector placement can require reducer alignment, cutting, welding, or fabrication to connect the remaining exhaust system.
Q12: What comes with the header kit?
A12: The listed kit includes the long tube headers, reducers, bolts, and metal gaskets.
Q13: Can these headers be installed at home?
A13: An experienced installer with suitable lifting equipment and exhaust-fabrication tools may complete the work. Clearance checks, tight engine-bay access, seized fasteners, collector alignment, and O₂ routing can make the installation more involved than a factory manifold replacement.
Q14: Who should not order this kit?
A14: Do not order by engine size alone. Choose another application if the vehicle is outside the listed years and models, or if its engine swap, suspension height, driveline, steering layout, or custom exhaust prevents the required clearance.
Q15: Are these headers legal for street use?
A15: Street-use and emissions requirements vary by location. Review the rules that apply to the vehicle before changing factory catalytic-converter, O₂ sensor, or emissions-system routing.
More Chevy Header Information
Compare other applications in the Flashark Chevrolet exhaust header collection, or read the Chevy 350 long tube and shorty header guide before choosing a header layout.