LS Series Flat Top Piston Kit

Part Number 311991 (132585560)

UPC: 193564039217

Package contents: 1 Each per Box

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Description

JE Auto forged pistons from JE Pistons are the result of over 75 years of industry leading experience extended to our range of premium forged pistons for LSX 12 and 15 Degree Engines. JE Pistons are designed for each specific engine and racing application to provide the ultimate combination of durability and performance. From drift track to drag strip, JE Pistons’ performance is proven in victory lane time and time again. Equipped with the following custom level features

JE pistons are all designed, forged, and machined in-house, allowing control over every step of the piston-making process. JE Pistons 7+ decades of experience in high-level racing has led to offering premium racing features, including full billet construction, EN plating, and purpose-designed coatings, to name a few.

Features & benefits

Accumulator Groove: A specialty groove between the top and second ring provides added volume for blow-by gases. This helps reduce pressure between the rings, improving top ring seal and minimizing ring flutter at high cylinder pressures.
Proprietary Forged Side Relief (FSR) forging design minimizes friction and power loss with reduced skirt width and saves additional weight with a shorter wrist pin
Pin Fit: The pin bore is precision honed to attain an exact pin clearance. Clearances typically range from .0003 to .0010 between the wrist pin and pin bore.
Double Pin Oilers: Deliver twice the amount of oil to the wrist pin as compared to the standard single pin oiler.
Designed specifically for LSX 12 and 15 Degree Engines. To provide optimized performance durability
Includes high-quality wrist pins, and locks
Made 100% in the USA
Forged in the USA using 2618 aluminum, yielding high tensile strength needed for high-demand performance applications

Specifications

2nd Groove Width	0.06 in
3D Undercrown Milling	No
Accumulator Groove	Yes
Anodize Top Ring Groove	No
Bore Diameter	4.005 in
Combo 2	No
Compression Height	1.065 in
Compression Ratio	11.90:1 / 64.00 CC Head
Connecting Rod Length	6.125 in
Contact Reduction	No
Country Of Origin	USA
Cylinder Head	LS 12 DEG/15 DEG COMBO VR
Deck Height	9.240 in
Double Pin Oilers	Yes
DVGP	No
Econo Undercrown Milling	No
EN Plating	No
Engine	LS2
Engine Displacement	413 cid
Engine Family	LS
Engine Stroke	4.100 in
Engine Type	ICE
Exhaust Angle	12
Exhaust Depth	S
Exhaust Diameter	2.000
Forging Type	FSR
Gas Distribution	No
Intake Angle	12
Intake Depth	.235 in
Intake Diameter	2.450 in
Lateral Gas Ports	No
Make	Chevrolet
Mill Undercrown	No
OEM Bore Diameter	4.000
Oil Groove Width	0.15000 in
Oil Ring Thickness	0.149 in
Oversized	Yes
Oversized Amount	0.005
Pin Fit	Yes
Piston Average Weight	350 gr
Piston Head Type	Flat
Piston Material	2618
Piston Quantity	8
Piston Series	JE Pistons
Piston Sub-Series	LS Flat Top
Piston To Wall Clearance	-0.003999 in
Piston Volume	-5.00 cc
Pro Seal Head Gasket	GM1016-051
Product Market	Domestic
Product Type	Engine Piston Kit
Ring Set - Recommended	JG3108-4000-7
Ring Set Included	No
Ring Set Thickness	1.20 MM x 1.50 MM x 3.00 MM
Second Compression Ring Thickness	0.0600 in
Skirt Coat	No
Smooth Crown Finish	No
Thermal Crown	No
Top Compression Ring Thickness	0.0480 in
Top Groove Width	0.04800 in
Tuff Skirt	No
Ultra Dome	No
Ultra Groove	No
Ultra Groove Plus Gas Port	No
Vertical Gas Ports	No
Wrist Pin Included	Yes
Wrist Pin Length	2.250 in
Wrist Pin Material	5115 Low Carbon Steel, Case Hardened
Wrist Pin Outer Diameter	0.927 in
Wrist Pin Part Number	927-2250-15-51C
Wrist Pin Retainer Included	Yes
Wrist Pin Retainer Part Number	927-073-MW
Wrist Pin Wall Thickness	0.150 in

Warranty

30 Months

Magnuson-Moss Warranty Act

Legally, a vehicle manufacturer cannot void the warranty on a vehicle due to an aftermarket part unless they can prove that the aftermarket part caused or contributed to the failure in the vehicle (per the Magnuson Moss Warranty Act (15 U.S.C. 2302(C)).

California residents

WARNING: This product can expose you to chemicals including nickel, which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.

Carb Status

California carb status to be completed