GM LS7 Series Dome Piston Kit

Part Number 311923 (132583923)

UPC: 193564039798

Package contents: 1 Each per Box

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Description

As the leader in forged racing pistons, JE Pistons has applied over 75 years of experience to its wide range of premium forged pistons for domestic applications. Engineered, forged and machined 100% in the USA, JE Pistons are designed for each specific engine and racing application to provide the ultimate combination of durability and performance. From dirt track to drag strip, JE Pistons? performance is proven in victory lane time and time again. Equip your engine with the best in forged pistons.

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

Made 100% in the USA
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
Accumulator groove (depending on application) helps reduce pressure from combustion gases, reducing ring fluttering and improving ring seal for consistent power
Skirt coating (depending on application) reduces friction and wear on piston skirts and cylinder walls while simultaneously reducing operating noise
Forged in the USA using 2618 aluminum, yielding high tensile strength needed for high-demand performance applications
Designed specifically for each engine and use application to provide optimized performance durability

Specifications

2nd Groove Width	0.06 in
Bore Diameter	4.1275 in
Compression Height	1.163 in
Compression Ratio	12.50:1 / 70.00 CC Head
Connecting Rod Length	6.077 in
Country Of Origin	USA
Cylinder Head	GM LS7 / LSX 12 DEG
Deck Height	9.240 in
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
Intake Angle	12
Intake Depth	.150 in
Intake Diameter	2.310 in
Make	Chevrolet
OEM Bore Diameter	4.125
Oil Groove Width	0.11750 in
Oil Ring Thickness	0.1175 in
Oversized	Yes
Oversized Amount	0.003
Piston Average Weight	446 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
Top Compression Ring Thickness	0.0480 in
Top Groove Width	0.04800 in
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