JE Pistons Bbf Dish Piston -39Cc 4.390 Bore, 4.500 Strk, 6.700 Rod, 170879
(Prior to Dispatch)
These inverted domepistons are compatible withturbocharged, nitrous andforced induction systems. Thevalve reliefs are designed toaccommodate oversized valvesand long duration, wide lobeseparation cams. PrecisionCNC machined ring groovesaccept 1/16, 1/16, 3/16 ringsand compression height isfigured for a 10.300" deckblock. Note: SVO A, C, E andBOSS aluminium heads requirecustom pistons.
Includes:
- Pin #990-2930-18-51S(174g)
- Double spirolocks #990-042-CS
Specifications:
- Part #:J170879
- CID: 520
- Bore: 4.390
- Stroke: 4.300
- RodLength: 6.800
- BlockHeight: 10.300
- Compression Height: 1.350
- Compression Ratio with74cc chamber volume: 9.7
- Compression Ratio with80cc chamber volume: 9.3
- Compression Ratio with94cc chamber volume: 8.5
- Dome Volume: -39.0cc
- Gram Weight: 568
- Footnote: .990 wrist pin,Piston set also suits 4.500"stroke with 6.700" rod length
- Oversize: 0.030
- Recommended Ring Set(Check Proseal listing todetermine oil ring tension):J10008-4390-5
With over 60 years ofexperience, JE Pistons is theleader in high performanceforged pistons. We've built areputation that thecompetition can only follow.JE has a history ofmanufacturing the highestquality pistons andcomponents that professionalengine builders, race teams,and high performanceenthusiasts trust and relyon.
The top enginebuilders 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-ArtCNC machines forturing along withpurpose-designed forgings, JEis able to maintain exactingspecifications on each andevery piston and holdtolerances to millionths ofan inch. Also available fromJE is industry-leadingprocesses like Ultra Crown, aDigital Three Dimensionalpiston crown machiningprocess and Finite ElementAnalysis (FEA). FEA is acomputer process wherebystress and fatigue are testedon a computer model before itgoes into production. JE isthe only performance pistonmanufacturer to earn theQS-9000 quality standardwhich confirms that JEprovides customers thehighest standards in qualitycontrol. In addition, we alsohave State-Of-The-Artinspection equipment andtesting equipment whichenables us to constantlybring you, the customer, thevery latest in piston designconfigurations.