Product Specifications
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.
