Straight Header for Big Block GX390 Clone Engines with Mounting Hardware

For those harnessing the grunt of a GX390 Clone, the straight-line efficiency of the RLV 5437 Header is indispensable, complete with hardware for immediate deployment.

• Straight design maximizes flow velocity, ideal for high-displacement engines craving quick spool-up.
• Replaces legacy H-GX-390-M pipes with modern tolerances for better sealing.

This header's no-nonsense profile cuts through restrictions, channeling exhaust directly to mufflers like WKAS1516 (4104) or WKAM (4106), sold apart. It keeps your big block breathing freely, translating to thunderous acceleration that leaves competitors in the dust.

Organizing larger engines can be tricky, but this piece simplifies connections, reducing clutter under the chassis. Builders praise its vibration resistance, ensuring mounts stay tight through bumpy sessions.

• Hardware Inclusion: Everything needed for a solid install, saving time at the track.
• Power Focus: Emphasizes low-end punch for drag-style starts or heavy kart classes.
• Durability Edge: Heat-treated materials endure the thermal stresses of big block output.

Step into the power arena with confidence, knowing your exhaust is tuned for dominance. This header isn't just functional—it's a catalyst for record-breaking runs. SKU: 5437.

Frequently Asked Questions

Q: Is the mounting hardware included with this header?

A: Yes, the RLV 5437 header comes complete with all necessary mounting hardware to ensure a secure and straightforward installation on your GX390 clone engine.

Q: Which mufflers are compatible with this straight header?

A: This header is designed to channel exhaust directly to compatible mufflers such as the RLV B91XL (WKAS1516) or the B91MO (WKAM) modified class silencer.

Q: Will this header improve my engine's performance?

A: The straight-line design maximizes flow velocity, which is ideal for high-displacement engines. It helps reduce exhaust restrictions, leading to quicker spool-up and improved low-end punch for drag-style starts.

Q: Is this header durable enough for bumpy track conditions?

A: Absolutely. The header is constructed from heat-treated materials designed to withstand the thermal stresses of big block output, and its profile is engineered to resist vibration, keeping your mounts tight during intense racing sessions.

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