GM LS7 Series Dome Piston Kit

Part Number 311926 (132583943)

UPC: 193564039781

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 GM LS7 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.
Skirt Coat: Skirt Coat reduces friction and wear on piston skirts and cylinder walls while simultaneously reducing operating noise
Smooth Crown Finish: Deburs all areas around the valve pocket and dome area, to reduces stress risers and prevent hot spots.
Forged in the USA using 2618 aluminum, yielding high tensile strength needed for high-demand performance applications
Double Pin Oilers: Deliver twice the amount of oil to the wrist pin as compared to the standard single pin oiler.
Designed specifically for GM LS7 Engines. To provide optimized performance durability
Includes high-quality wrist pins, and locks
Made 100% in the USA

Specifications

2nd Groove Width	0.06 in
3D Undercrown Milling	No
Accumulator Groove	Yes
Anodize Top Ring Groove	No
Bore Diameter	4.1275 in
Combo 2	No
Compression Height	1.115 in
Compression Ratio	12.50:1 / 70.00 CC Head
Connecting Rod Length	6.125 in
Contact Reduction	No
Country Of Origin	USA
Cylinder Head	GM LS7 / LSX 12 DEG
Deck Height	9.240 in
Double Pin Oilers	Yes
DVGP	No
Econo Undercrown Milling	No
EN Plating	No
Engine	LS7
Engine Displacement	428 cid
Engine Family	LS
Engine Stroke	4.000 in
Engine Type	ICE
Exhaust Angle	12
Exhaust Depth	.120
Exhaust Diameter	1.750
Forging Type	FSR
Gas Distribution	No
Intake Angle	12
Intake Depth	.150 in
Intake Diameter	2.310 in
Lateral Gas Ports	No
Make	Chevrolet
Mill Undercrown	No
OEM Bore Diameter	4.125
Oil Groove Width	0.15000 in
Oil Ring Thickness	0.149 in
Oversized	Yes
Oversized Amount	0.003
Pin Fit	Yes
Piston Average Weight	439 gr
Piston Head Type	Dome
Piston Material	2618
Piston Quantity	8
Piston Series	JE Pistons
Piston Sub-Series	LS7 Dome
Piston To Wall Clearance	-0.004 in
Piston Volume	3.10 cc
Pro Seal Head Gasket	GM1021-051
Product Market	Domestic
Product Type	Engine Piston Kit
Ring Set - Recommended	JG31F8-4125-2
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	Yes
Smooth Crown Finish	Yes
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

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