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The 27-3622 Diamond piston kit is a 92mm forged performance piston designed for GX390 and 460cc engines. Built for high compression and durability, it includes piston, wrist pin, and clips (rings sold separately). See full product details below.
The 27-3622 Diamond piston kit is a high-performance forged piston designed for GX390 and 460cc big block engines. Built from premium materials, this piston is engineered to handle increased cylinder pressure, higher RPM, and demanding racing conditions.
With a 92mm (3.622") bore, this piston is commonly used in 440cc–460cc builds when paired with stroker crankshafts. It is ideal for builders looking to increase compression, improve combustion efficiency, and maximize engine output.
The forged construction provides significantly greater strength compared to cast pistons, allowing it to withstand extreme heat and stress in high-performance applications.
This kit includes the piston, wrist pin, and retaining clips. Piston rings are NOT included and must be purchased separately to match your specific application and build requirements.
Important Fitment Notice: Designed for 92mm bore applications. Engine block must be machined accordingly. Verify clearance and compatibility before installation.
No, this piston kit does NOT include rings. Rings must be purchased separately.
It fits GX390, Predator 420, and similar big block clone engines when machined for a 92mm bore.
This is a 92mm (3.622") piston designed for big bore applications.
Yes, this is a forged Diamond piston designed for high-performance use.
Yes, the engine block must be bored to fit a 92mm piston and proper clearances must be set.
Complete your engine build with ARC Racing components including billet connecting rods, stroker crankshafts, and performance camshafts. Pair this piston with the correct ring set and cylinder machining to maximize compression and power output.
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