ACDelco RTV Engine Sealant 75 g — GM OE high-viscosity silicone gasket maker, fast-curing durable seal

This 75 g (2.65 ounce) tube of ACDelco RTV silicone (part no. 88864346) is made in the United States to meet GM OE specifications and cure into a durable, flexible gasket when exposed to air. It’s built for automotive engine assembly and repairs where a dependable, oil- and coolant-compatible joint is required. The formula allows fast handling and can be exposed to fluids shortly after torqueing, making it practical for busy workshops and do-it-yourself maintenance.

Which engine areas can I use this RTV sealant on?

The ACDelco 10-2006 RTV is formulated for multiple engine sealing points that typically require a silicone gasket maker. It performs well on both flat and irregular mating surfaces and remains flexible after curing.

• Oil pans and ladder frame joints
• Front and rear cover flanges and T-joints
• Intake and exhaust manifold corners and end seals
• Cam covers and valve covers that need a resilient seal

How quickly can I reassemble and fill fluids after applying it?

This RTV has been engineered for quick turnaround: once applied and bolts are torqued, the assembly can be exposed to oil or coolant immediately. The product cures by reacting with moisture in the air, so it begins skinning quickly while continuing to set into a flexible gasket over time.

• No long fluid-drain wait times — suitable for same-day reassembly
• High-viscosity consistency reduces drip and run-off during application
• Forms a lasting, pliable seal that tolerates engine service fluids

What are the performance characteristics and handling tips?

ACDelco 10-2006 is a non-runny, high-viscosity silicone that cures on exposure to air and produces a durable seal. Apply with a standard caulking gun or squeeze tube, ensure mating surfaces are clean and dry, and allow recommended cure time for full strength before heavy-duty service.

• High-viscosity formula minimizes sag on vertical surfaces
• Cures by air exposure to form a resilient silicone gasket
• Works with common engine fluids once assembled and torqued

Is this product compatible with GM and aftermarket components?

Manufactured to GM Original Equipment standards, this RTV is suitable for GM engines and widely compatible with many aftermarket parts where silicone sealants are specified. Verify specific vehicle service information when replacing OEM gaskets or using on specialized materials.

• Meets GM OE expectations for engine sealing applications
• Appropriate for most aluminum and steel mating surfaces
• Check manufacturer guidance for specialty polymer or coated surfaces

Who this is for: mechanics, restoration enthusiasts and vehicle owners who need a dependable silicone gasket maker for engine repairs will appreciate this ACDelco RTV. It’s especially useful when OEM-style performance, quick reassembly, and a high-viscosity, non-sag product are priorities. Use it for routine maintenance, gasket replacement, or repair where a flexible, fluid-tolerant seal is required.