These SR20 Big Block Chevy Pistons are Ready to go Drag Racing | JE Pistons

SR20 BBC Drag Racing Pistons from JE

These SR20 Big Block Chevy Pistons are Ready to go Drag Racing | JE Pistons

By Kevin Bailey
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The New 20° Series Big Block Chevy Pistons from JE

JE Pistons' latest addition to our lineup of BBC pistons are designed for 20° cylinder heads and are purpose-designed and purpose-built to deliver performance and durability on the drag strip. We've built countless sets of custom pistons for SR20 BBC builds, so we thought why not throw our best features and techniques at a complete line of shelf parts? This way, our racers still get the custom performance they need without the longer lead times of the custom piston process. 

Our SR20 BBC pistons are built to serve your high horsepower build, whether you're lining up for traditional drag racing, Grudge racing, or No Prep. Engineered, forged, and machined in-house in the USA using 2618-T6 aluminum, these BBC pistons are offered in nitrous and N/A dome configurations and cover bore sizes from 4.600" to 4.625". Each set of slugs feature proprietary, innovative features, including:

Contact reduction grooves machined into the piston above the top ring groove help minimize expansion in that area to reduce contact with the cylinder wall, reducing friction and minimizing pressure. A specially design 'Power Adder' accumulator groove provides more surface area than a traditional design to trap gases that make it past the top ring, helping prevent ring flutter and keeping ring seal consistent.

The piston dome design features smooth radius shaping and a strategically-placed fire slot to help improved flame travel and efficiency during combustion. Consistent combustion patterns help reduce hot spots, lowering chances of creating high-stress areas on the piston and maintaining durability.

Vertical gas ports allow combustion gases to travel into the back of the top ring groove. During engine operation, these gases push the top ring out and against the cylinder wall, helping maintain consistent ring seal. Ultra-Groove is achieved through an additional ring groove machining operation that creates an incredibly flat and uniform surface for the top ring, further supporting optimal ring seal.

Want to learn more on gas porting? We dive deep into the technical details here.

Our 3D undercrown milling operation removes unnecessary material from the undercrown of the piston, allowing the part to maintain its integrity and strength while reducing the overall weight.

Keeping the wrist pin lubricated is critical to prevent wear and failure, especially in high-horespower NA and power adder builds. Broach pin oilers are perpendicular slots machined into the pin bore that allow oil to accumulate and maintain a film between the pin bore and pin surface. For good measure, and additional groove is machined in the pin bore parallel with the lock groove, helping guide the oil accumulated in the broach consistently across the pin bore.

Want to learn more about pin oiling? Check out our guide to different wrist pin oiling styles here.

Combined, these features help create the ultimate package for 20°-headed BBC builds, but we didn't stop there. The valve pockets on our SR20 pistons are designed to accomodate 2.450" intake valves, covering even more build scenarios with shelf part availability. Additionaly, these pistons are designed for a robust ring pack with .043" steel top ring, ductile iron Napier second ring, and 3mm oil ring. After all, what good are performance pistons without performance rings to match?

Ready to get your Big Block fitted with a set of these forged slugs? Click below to download the complete product data sheet listing all 40 different configurations these SR20 pistons are available in.

20˚ Series BBC | JE Pistons
Designed for Dart 20˚ Pro 1 (97cc chamber) and Brodix SR20 20˚ (95cc chamber)
Part Number CI Bore Stroke C/R CD Dome Volume Gram Weight Recommended Ring Set
377854 582 4.6 4.375 14.5 1.06 18 572 CSH40105
377855 583 4.605 4.375 14.5 1.06 18 573 CSH40105
377856 584 4.61 4.375 14.5 1.06 18 574 CSH401015
377857 585 4.615 4.375 14.5 1.06 18 575 CSH401015
377858 588 4.625 4.375 14.5 1.06 18 576 CSH401030
377886 565 4.6 4.25 14 1.12 18 599 CSH40105
377889 566 4.605 4.25 14 1.12 18 600 CSH40105
377890 568 4.61 4.25 14 1.12 18 601 CSH401015
377887 569 4.615 4.25 14 1.12 18 602 CSH401015
377888 571 4.625 4.25 14 1.12 18 603 CSH401030
377891 598 4.6 4.5 14.8 1.155 18 614 CSH40105
377892 600 4.605 4.5 14.8 1.155 18 615 CSH40105
377893 601 4.61 4.5 14.8 1.155 18 616 CSH401015
377894 602 4.615 4.5 14.8 1.155 18 617 CSH401015
377895 605 4.625 4.5 14.8 1.155 18 618 CSH401030
377896 565 4.6 4.25 14 1.27 18 653 CSH40105
377897 566 4.605 4.25 14 1.27 18 654 CSH40105
377898 568 4.61 4.25 14 1.27 18 655 CSH401015
377899 569 4.615 4.25 14 1.27 18 656 CSH401015
377900 571 4.625 4.25 14 1.27 18 657 CSH401030
377901 582 4.6 4.375 15.3 1.06 23 578 JG7708-4600-5
377902 583 4.605 4.375 15.3 1.06 23 579 JG7708-4600-5
377903 584 4.61 4.375 15.3 1.06 23 580 JG7708-4610-5
377904 585 4.615 4.375 15.3 1.06 23 581 JG7708-4610-5
377905 588 4.625 4.375 15.3 1.06 23 582 JG7708-4625-5
377907 565 4.6 4.25 14.8 1.12 23 605 JG7708-4600-5
377908 566 4.605 4.25 14.8 1.12 23 606 JG7708-4600-5
377909 568 4.61 4.25 14.8 1.12 23 607 JG7708-4610-5
377910 569 4.615 4.25 14.8 1.12 23 608 JG7708-4610-5
377911 571 4.625 4.25 14.8 1.12 23 609 JG7708-4625-5
377912 598 4.6 4.5 15.6 1.155 23 619 JG7708-4600-5
377913 600 4.605 4.5 15.6 1.155 23 620 JG7708-4600-5
377914 601 4.61 4.5 15.6 1.155 23 621 JG7708-4610-5
377915 602 4.615 4.5 15.6 1.155 23 622 JG7708-4610-5
377916 605 4.625 4.5 15.6 1.155 23 623 JG7708-4625-5
377917 565 4.6 4.25 14.8 1.27 23 658 JG7708-4600-5
377918 566 4.605 4.25 14.8 1.27 23 659 JG7708-4600-5
377919 568 4.61 4.25 14.8 1.27 23 660 JG7708-4610-5
377920 569 4.615 4.25 14.8 1.27 23 661 JG7708-4610-5
377921 571 4.625 4.25 14.8 1.27 23 662 JG7708-4625-5
1 month ago