JE Pistons Bbc 4.500" Pistons -3Cc Flat 4.000" St 6.385" Rod 1.395" Ch 257971
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These big block pistonsare compatible with forcedinduction, nitrous (Except1.120 compression height) andangle milled heads. Valvereliefs will accommodateoversized valves and longduration, tight lobeseparation cams. PrecisionCNC machined ring groovesaccept 1/16, 1/16, 3/16rings. Will fit both open andclosed chamber cylinderheads.
Includes:
- Pin#990-2930-15-51S(150g) -1.120" Compression height
- Pin#990-2930-18-51S(174g) -1.245" Compression height andabove
- Double spirolocks #990-042-CS
Standard Deck BlockSpecifications:
- Part #: J257971
- CID: 509
- Bore: 4.500
- Stroke:4.000
- Rod Length:6.385
- Block Height:9.780
- CompressionHeight: 1.395
- Compression Ratio with 110ccchamber volume: 9.5
- ompression Ratio with 118ccchamber volume: 9.0
- Compression Ratio with 124ccchamber volume: 8.6
- Dome Volume: -3.0cc
- Gram Weight: 637
- Oversize: .034
- Recommended Ring Set (CheckProseal listing to determineoil ring tension):J100F8-4500-5
Tall Deck BlockSpecifications:
- Part #: J257971
- CID: 572
- Bore: 4.500
- Stroke:4.500
- Rod Length:6.535
- Block Height:10.180
- CompressionHeight: 1.395
- Compression Ratio with 110ccchamber volume: 10.4
- Compression Ratio with 118ccchamber volume: 9.9
- Compression Ratio with 124ccchamber volume: 9.5
- Dome Volume: -3.0cc
- Gram Weight: 637
- Oversize: .034
- Recommended Ring Set (CheckProseal listing to determineoil ring tension):J100F8-4500-5
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 formanufacturing 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.