What 1400HD Delivers
Wiseco’s 1400HD series is built for:
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High-boost street builds
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Track and drag applications
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Elevated cylinder pressure
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Big turbo upgrades
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E85 and race fuel setups
These are forged pistons designed to survive aggressive tuning.
Product Overview:
– Wiseco Sport Compact Piston And Ring Kits Give You Stronger Pistons And Tighter Tolerances Than Any Other Part In Your Engine, With Less Internal And External Machining. Wiseco’s Advanced Forging Process And Extensive Heat-Treating And Finishing Processes Ensure The Performance And Reliability That You Demand From Your Engine. These Kits’ Crown Thickness And Ring Lands Are Designed For Power-Adders Like Turbos And Blowers And Nitrous Oxide.
Product Info:
– Wiseco 1400 Hd Mitsu Evo 8 – 4G63 Turbo -14Cc Piston Shelf Stock Kit
Manufacturer Part Number:
– Part Number: K626m855ap
Key Specifications
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Part Number: K626M855AP
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Engine: 4G63 Turbo
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Application: Evo 8
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Dish Volume: -14cc
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Forged aluminum construction
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Designed for performance compression setups
⚠️ Always confirm bore size and desired compression ratio before ordering.
Product Specifications:
– Sold As A Kit.
– Piston Rings Included: Yes
– Bore (Inch): 3.366 Inch
– Bore (Mm): 85.500Mm
– Stroke: 3.465 Inch
– Rod Length: 150.000Mm
– Piston Style: Dish, With Four Valve Reliefs
– Piston Material: Forged Aluminum
– Compression Height (Inch): 1.378 Inch
– Piston Head Volume (Cc): +14.00Cc
– Wrist Pin Style: Press-Fit Or Floating
– Wrist Pin Retainers Included: Yes
– Wrist Pin Included: Yes
– Pin Diameter (Inch): 0.866 Inch
– File Fit: Yes
– Top Ring Thickness: 1.0Mm
– Top Ring Material: Steel
– Top Ring Facing Material: Gas Nitrided
– Second Ring Thickness: 1.2Mm
– Second Ring Material: Cast Iron
– Second Ring Facing Material: Phosphate Coated
– Oil Ring Thickness: 2.8Mm
– Oil Ring Material: Stainless Steel
– Oil Ring Tension: Standard
– Notes: Fits 4G63 Engines, Second Generation 7-Bolt. Pistons Include 0.225 Inch Wall Tool Steel Pins.
Why Forged Pistons Matter
Compared to factory cast pistons:
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Stronger under detonation
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Better heat resistance
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Improved ring land durability
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Higher RPM tolerance
On a built 4G63, forged internals are the foundation.
Ideal Applications
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Upgraded turbo Evo 8 builds
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Forged bottom-end rebuilds
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400–700+ HP setups (supporting mods required)
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Tuned street and track cars
Pair with forged rods, ARP hardware, and proper machine work for best results.
Important information
Legal Disclaimer
This product is an aftermarket product. It is not OEM and is neither manufactured nor sold by the vehicle manufacturer listed. We are not affiliated with the vehicle manufacturer.
Installation Notes
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Measure cylinder bore accurately
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Set proper piston-to-wall clearance
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Gap rings based on boost level
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Balance rotating assembly
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Follow proper break-in procedure
Because piston clearance is not “close enough” territory.
Final Verdict
The Wiseco 1400HD -14cc Piston Kit (K626M855AP) for Evo 8 4G63 is built for serious turbo builds demanding strength and reliability. Forged construction, performance-focused dish design, and proven durability under boost.
Because if you’re building it once, build it strong.
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