Wiseco Mitsu Evo 4-9 4G63 Asymmetric Skirt Bore 85.50mm - Size +.020 - CR 9.5 Piston Set

SKU: WISK666M855AP

Pistons

WIS Piston Sets - 4 Cyl...

Wiseco

Wiseco Mitsu Evo 4-9 4G63 Asymmetric Skirt Bore 85.50mm - Size +.020 - CR 9.5 Piston Set

SKU: WISK666M855AP

Pistons

WIS Piston Sets - 4 Cyl...

LOW STOCK! Est Ship 3-5 days. HURRY! LOW STOCK. This item is in limited stock at one of our distribution centres. The ETA is the approximate time required to prepare your order for dispatch.

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Description

Professional Series forged racing pistons from Wiseco are no-expense-spared pistons designed for the serious racers and builders. Packed full of custom-level performance and durability features and provided with premium rings, Professional Series pistons are designed and built for use in heavy to severe duty race builds. Remove your limits with Wiseco's Professional Series.

Part Type

Engine Piston Set

Data: v4.2 - Upd: 2026-10-14 16:45:45

Features

ArmorGlide Skirt Coating: seizure resistant, friction reduction, and quieter operation
Designed and built to withstand heavy to severe duty performance applications
Engineered, forged, and machined in the USA from 2618 aluminum for improved tensile strength
Forced pin oiling
Fully machined crown features
Precision ring grooves, anti-detonation groove, and additional ring seal improving features

Specifications

Product Attributes - UPC: 00193564089939
Product Attributes - Brand: Wiseco
Product Attributes - Stroke: 88.00mm
Product Attributes - Gapless: No
Product Attributes - File Fit: No
Product Attributes - Quantity: Sold as a set of 4.
Product Attributes - Bore (mm): 85.500mm
Product Attributes - Part Type: Pistons
Product Attributes - Bore (in.): 3.367 in.
Product Attributes - Rod Length: 150.000mm
Product Attributes - Piston Style: Dish, with four valve reliefs
Product Attributes - Product Line: Wiseco Professional Series Pistons
Product Attributes - Piston Material: Forged aluminum
Product Attributes - Wrist Pin Style: Press-fit or floating
Product Attributes - Engine Stroke Type: Stock
Product Attributes - Oil Ring Thickness: 2.8mm
Product Attributes - Pin Diameter (in.): 0.866 in.
Product Attributes - Top Ring Thickness: 1.0mm
Product Attributes - Wrist Pin Included: Yes
Product Attributes - Piston Ring Thickness: 1.00mm x 1.20mm x 2.80mm
Product Attributes - Piston Rings Included: No
Product Attributes - Second Ring Thickness: 1.2mm
Product Attributes - Piston Head Volume (cc): +9.50cc
Product Attributes - Compression Height (in.): 1.374 in.
Product Attributes - Manufacturer's Part Number: K666M855AP
Product Attributes - Wrist Pin Retainers Included: Yes

Reference Information

Brand Name/s	Wiseco
StreetFX SKU	wisK666M855AP
SFX Item ID	4063393
Supplier Item Code	4063393
Manufacturer SKU	K666M855AP
Manufacturer UPC	193564089939
Alternative References	4G63, 85.50mm