The SPOOLOGIC Pro-Series V-Band Clamp SL-330-033 is the turbo inlet mouthpiece clamp for 2004.5-2010 Chevrolet Silverado GMC Sierra 2500 3500 6.6L Duramax LLY LBZ LMM; 2006-2010 Chevrolet Express GMC Savana 2500 3500 4500 6.6L Duramax LLY LMM. Engineered to last a lifetime — stainless from band to latch, with no stamped or carbon-steel failure points.

Every Pro-Series clamp is built from corrosion-resistant 304 stainless steel: a mandrel-formed 304SS band, floating V-segments, a heavy-gauge 304 stainless T-bolt, a flanged stainless lock nut, and a Pro-Series Stainless T-Bolt Latch with Quick-Release Action. The upgraded latch is the critical difference — OEM and budget aftermarket clamps use a thin-gauge stamped sheet-metal latch loop that tears under thermal cycling and clamp tension. That stamped loop is the #1 failure point on factory V-band clamps. The Pro-Series latch eliminates it.

Common V-Band Clamp Failure Symptoms

If your 6.6L Duramax truck is showing any of these symptoms, the factory or budget aftermarket clamp is most likely the cause:

• Latch loop tearing or stretching — the thin-gauge stamped sheet-metal loop on factory and budget clamps tears, lets the T-bolt slip, and the clamp loses tension
• Exhaust or boost leak at the V-band joint — ticking, hissing, or sooting around the clamp under load
• Clamp band stretching or warping from heat cycling — thin OEM bands lose clamping force over time
• Corroded T-bolt or seized nut — non-stainless OEM hardware rusts in place and breaks during service

Why the Pro-Series Latch Outlasts OEM

OEM and budget aftermarket V-band clamps cut cost on the smallest part of the clamp — the latch loop that the T-bolt hooks through. That single stamped sheet-metal loop carries the full clamping load and is the first thing to fail. The SPOOLOGIC Pro-Series latch is built from solid heavy-gauge stainless with quick-release action, designed to outlast the truck itself.

What's Included

• (1) SPOOLOGIC Pro-Series V-Band Clamp — Turbo Inlet Mouthpiece

Fits 2004.5-2010 6.6L Duramax LLY LBZ LMM / 6.6L Duramax LLY LMM

• 2004.5 – 2010 Chevrolet Silverado GMC Sierra 2500 3500 6.6L Duramax LLY LBZ LMM
• 2006 – 2010 Chevrolet Express GMC Savana 2500 3500 4500 6.6L Duramax LLY LMM

Turbo Applications

• Fits factory GT3788VA (2004.5-2010 6.6L LMM Duramax)

Replaces Factory OEM Part Numbers

This clamp replaces the following factory OEM and aftermarket cross-reference numbers:

• GM OEM: 12674775, 12683493

Backed by a Lifetime SPOOLOGIC Warranty

The SPOOLOGIC Pro-Series V-Band Clamp is designed to last a lifetime. Every component — the mandrel-formed 304SS band, the floating V-segments, the heavy-gauge 304 stainless T-bolt, the flanged stainless lock nut, and the Pro-Series stainless quick-release latch — is built from corrosion-resistant stainless steel with no stamped or carbon-steel failure points. If the clamp fails under normal use, SPOOLOGIC will replace it for the original purchaser — no time limit, no questions.

Features

• Pro-Series Stainless T-Bolt Latch with Quick-Release Action — replaces the stamped sheet-metal loop that fails on OEM clamps
• Mandrel-formed 304SS band with floating V-segments for even clamping force
• Heavy-gauge 304 stainless T-bolt and flanged stainless lock nut — no corrosion, no seizing
• Application-specific — direct-fit turbo inlet mouthpiece clamp for 6.6L Duramax
• Designed to last a lifetime — backed by a Lifetime SPOOLOGIC Warranty