Camshaft Retainer Plate Gasket & LS Cam Thrust Bolt Kit

koxuyim's Camshaft Retainer Plate Gasket paired with the ARP-style cam thrust bolt kit is a direct-fit replacement for GM 12589016 applications on Gen 3–5 LS and LT engines, restoring proper camshaft sealing and thrust control.

This kit combines a precision-cut camshaft retainer plate gasket with a high-strength cam thrust bolt set engineered to match the fit and function of OE GM parts (interchange numbers BTR89016, 83470, 61220G, 12589016; cross B31822). It’s designed for street builds, performance upgrades, and engine rebuilds on LS1, LS2, LS3, LSX and many LT-series platforms, delivering reliable sealing around the cam retainer and secure camshaft thrust fastening that resist leaks and movement under load.

How does this kit restore camshaft sealing and prevent leaks?

The koxuyim gasket is die-cut to the same profile as the factory retainer plate gasket, providing consistent compression and sealing surfaces to keep oil within the cam gallery. Proper sealing reduces the chance of oil weeping around the retainer and into accessory areas, maintaining correct oil flow and cleanliness in the valvetrain area.

• Exact-fit gasket shape for GM Gen 3–5 LS and LT engines.
• Durable material selected for oil and heat resistance.
• Prevents external oil seepage from the cam retainer area.

What makes the included cam thrust bolts suitable for performance engines?

The bolt kit mirrors the ARP 134-1003 High Performance Series specifications used across many LS and LT builds, supplying high tensile strength and consistent clamping force for camshaft thrust control. Stronger bolts reduce stretch and loosening risk during high-RPM or modified engine operation, keeping camshaft endplay within design limits.

• High-strength construction for consistent clamping and durability.
• Compatibility with LSX, LS1, LT1, L83, L86, L87, L84, LT4, LQ4, LQ9, LS2, LS3 platforms.
• Lowers chance of bolt failure or camshaft movement under stress.

Is this a direct replacement for the factory part numbers and cross-references?

Yes — the kit is manufactured to match the form and function of common GM retainer plate part numbers (12589016 and listed alternates) and interchange B31822, making it suitable as a like-for-like replacement during rebuilds or repairs. That interchangeability simplifies parts sourcing and ensures the retainer plate mates correctly with OEM housings.

• Replaces GM part numbers: 12589016, BTR89016, 83470, 61220G.
• Interchange: B31822 for broader compatibility.
• Designed for drop-in fit during routine camshaft service or rebuild.

How should I install the gasket and bolts to get reliable results?

Install the gasket on a clean, oil-free retainer face and use the thrust bolts torqued to the manufacturer or ARP-specified values. Clean mating surfaces, inspect for warpage or damage, and follow torque sequence to ensure even clamping and sealing performance.

• Clean and degrease mating surfaces before installation.
• Use proper torque specs and sequence; consider thread lubricant if specified.
• Inspect retainer plate and cam for wear before final assembly.

Who is this for? Mechanics, engine builders, and DIY enthusiasts working on GM LS or LT engines who need a dependable, cost-effective replacement for the camshaft retainer plate gasket and a high-quality cam thrust bolt set. It’s appropriate for everyday drivers, performance projects, and full engine rebuilds where correct sealing and cam control are required without custom modification.