JE Pistons Ls 4.130" Piston -5Cc 4.000 St 6.125 Rod 1.115" Ch Asymmetr 311986

GM LS Flat Top Our brandnew Asymmetrical FSR (ForgedSide Relief) forging designallows for the use of the mostpopular stroke and rodcombinations while eliminatingreluctor wheel clearanceproblems. Asymmetrical forgingdesign maintains a largerskirt on the heavily stressedmajor thrust side, whilereducing friction with asmaller skirt on the minorthrust side. The result is ahigh strength, lightweightpiston that significantlyreduces friction in yourengine. Lightweight andextremely durable, thesepistons are machined for1.2mm, 1.5mm, 3.0mmrings.

Includes:

• .927 x2.250 straight wall carbonsteel wrist pin
• Wirelocks

Specifications:

• Part #:J311986
• Bore:4.130"
• Oversize: .005"LS7
• Stroke:4.000
• Rod Length:6.125"
• CompressionHeight:1.115"
• CompressionRatio with 64cc chambervolume:12.2
• Compression Ratiowith 68cc chamber volume:11.7
• Compression Ratiowith 70cc chamber volume:11.4
• Dome Volume:-5cc
• GramWeight:
• Footnote:Forged SideRelief
• ReconmendedRing Set:JG31F8-4135-5

Withover 60 years of experience,JE Pistons is the leader inhigh performance forgedpistons. We've built areputation that thecompetition can only follow.JE has a history ofmanufacturing the highestquality pistons and componentsthat professional enginebuilders, race teams, and highperformance enthusiasts trustand rely on.

The topengine builders in NASCAR,ALMS, NHRA, AMA Supercross andothers choose JE Pistons overany other brand. For over 60years, JE's position at theforefront of performancepiston manufacturing has beena result of continuousresearch and development ofunique materials, pistondesigns and technologies.Utilising State-Of-The-Art CNCmachines for manufacturingalong with purpose-designedforgings, JE is able tomaintain exactingspecifications on each andevery piston and holdtolerances to millionths of aninch. Also available from JEis industry-leading processeslike Ultra Crown, a DigitalThree Dimensional piston crownmachining process and FiniteElement Analysis (FEA). FEA isa computer processwherebystress and fatigue are testedon a computer model before itgoes into production. JE isthe only performance pistonmanufacturer to earn theQS-9000 quality standard whichconfirms that JE providescustomers the higheststandards in quality control.In addition, we also haveState-Of-The-Art inspectionequipment and testingequipment which enables us toconstantly bring you, thecustomer, the very latest inpiston designconfigurations.