302 ci SB Ford - Flat Top Hypereutectic Pistons347 c.i., 4.030" bore, 3.400 stroke, 5.400" rod length, .912 Pin -5.0cc dome volumeBrand: SPEEDPROPart Number: SPH139CL 030Description: These ruggedly durable pistons are made with exclusive high strength FM425 alloy, and enhanced with 16.5% silicon for excellent tensile strength and scuff resistance. This advanced metallurgy permits tighter bore clearances, which help minimise noise on cold engine start-up. These pistons are the ideal choice for street performance applications and late-model replacement.
More Sealed Power hypereutectics benefits:
- Higher strength than cast or forged at operating temperature
- Finely dispersed silicon particles provide a highly resistant wear surface and reduces scuffing
- Lower material growth allows pistons to be fit tighter, improving cylinder sealing for less blow-by and more power
- High silicon content allows elimination of groove inserts in certain applications
- Designed to retain standard ring gaps in the top groove
Piston Specifications :
- CID: 347
- Bore: 4.030
- Stroke: 3.400
- Rod Length: 5.400
- Compression Height: 1.090
- Compression Ratio with 58cc chamber volume: 10.47
- Compression Ratio with 60cc chamber volume: 10.20
- Compression Ratio with 63cc chamber volume: 9.90
- Dome Volume: -5.0cc
- Pin Type: Floater with tapered lightweight pin
- Recommended Ring Set: Moly - N/A, STD Fit - SPR9968 030, File Fit - SPR9342 035
- CNC machined, lightweight, coated skirt
