koxuyim Camshaft Retainer Plate Gasket & ARP Cam Thrust Bolt Kit 12589016 — LS/LT Fit, High Clamping Strength

Whether you're rebuilding an LS1 or upgrading a modern LT-series motor, the koxuyim retainer plate gasket and accompanying ARP bolt kit give you the sealing integrity and hardware strength required for reliable camshaft positioning. This assembly swaps in for OE numbers like 12589016, BTR89016, 83470, and 61220G and is compatible across a wide range of GM powerplants to help prevent leaks and maintain proper valve-train geometry.

How does this gasket and bolt kit improve camshaft sealing?

The koxuyim retainer plate gasket is designed to match the OEM contour of LS and LT camshaft housings, delivering a consistent compression seal across the retainer plate surface. When combined with the ARP high-performance bolts, the assembly resists loosening under vibration and thermal cycling.

• Precision-cut gasket material that mates to factory surfaces for even compression.
• ARP 134-1003 bolts provide higher clamping force than stock hardware.
• Helps block oil migration and external contaminants from the camshaft bore.

Will this fit my GM engine and replace the original part number?

This kit is made for Gen 3, Gen 4, and Gen 5 LS and LT engines and cross-references common OEM and aftermarket part numbers, making it a true direct-replacement option. Check your engine casting and donor part number list to confirm compatibility before ordering.

• Replaces OE numbers including 12589016, BTR89016, 83470, and 61220G.
• Interchanges with aftermarket reference B31822.
• Compatible with LS1, LS2, LS3, LSX, LT1, LT4, L83, L86, L87 and similar platforms.

What benefits do ARP bolts bring versus stock fasteners?

ARP performance series bolts are manufactured to tighter tolerances and stronger alloys than many factory fasteners, reducing the chance of bolt stretch or loosening under hard use. They preserve the clamping load longer, which is critical for maintaining the retainer plate's seal and proper cam thrust alignment.

• Stronger material for superior tensile strength.
• Improved thread fit for more consistent torque readings.
• Less prone to fatigue during repeated thermal cycles.

How should I install the retainer plate gasket and bolt kit?

Install on a clean, oil-free surface and follow torque specs for the ARP hardware to avoid uneven load on the retainer plate. Use new bolts and the correct tightening sequence to maintain flatness of the plate and preserve gasket integrity.

• Clean mating surfaces thoroughly before assembly.
• Apply thread lubricant only as ARP recommends for accurate torque values.
• Tighten bolts in the proper order to specified torque increments.

Who is this for? Mechanics and DIY enthusiasts rebuilding, repairing, or upgrading GM LS and LT engines who want a reliable, cost-effective replacement for the camshaft retainer plate seal and stronger, longer-lasting cam thrust fasteners. Ideal for street engines, performance builds, and maintenance jobs where correct sealing and consistent clamp load are essential.