SMALL BLOCK CHEVY
BIG BLOCK CHEVY
FORD
MOPAR
BUICK
NHRA
BIG BLOCK INVERTED DOME

These big block pistons are compatible with forced induction, nitrous and angle milled heads. The inverted dome shape has been designed for maximum efficiency and horsepower. Valve reliefs will accommodate oversized valves and long duration, tight lobe separation cams. Compression Height figured using 9.780 block height with zero deck clearance. Precision CNC machined ring grooves accept 1/16, 1/16, 3/16 rings. Will fit both open and closed chamber cylinder heads.

Includes:
Pin #990-2930-18-51S (174g)
Double spiro locks (#990-042-CS)

Big Block Chevy Inverted Dome Series
Std Bore: 427/454 = 4.250, 502 BBC = 4.466
Ring package designed for: 1/16, 1/16, 3/16 Rings
 Tech and Installation Tips
 Valve Relief Diagram
Part # Cubic
Inches		 Bore Stroke Rod
Length		 Block
Height		 Compression
Distance
Head Cubic Centimeters
110cc 118cc 124cc
Compression Ratio
Dome
Volume		 Gram
Weight		 Footnote Oversize
257942 540 4.500 4.250 6.385 9.780 1.270 8.8 8.4 8.1 -20.0 569 B 0.034
257943 548 4.530 4.250 6.385 9.780 1.270 8.9 8.5 8.2 -20.0 611 B 0.064
257944 555 4.560 4.250 6.385 9.780 1.270 9.0 8.6 8.3 -20.0 591 B 0.094
257945 565 4.600 4.250 6.385 9.780 1.270 9.2 8.8 8.5 -20.0 608 B 0.134
257946 467 4.310 4.000 6.385 9.780 1.395 8.0 7.6 7.4 -14.5 576 B 0.060
257947 509 4.500 4.000 6.385 9.780 1.395 8.0 7.6 7.4 -28.0 586 B 0.034
257948 516 4.530 4.000 6.385 9.780 1.395 8.1 7.7 7.5 -28.0 597 B 0.064
257949 523 4.560 4.000 6.385 9.780 1.395 8.2 7.8 7.5 -28.0 610 B 0.094
257950 532 4.600 4.000 6.385 9.780 1.395 8.3 7.9 7.7 -28.0 627 B 0.134
257951 540 4.500 4.250 6.135 9.780 1.520 8.8 8.4 8.1 -20.0 626   0.034
257953 548 4.530 4.250 6.135 9.780 1.520 8.9 8.5 8.2 -20.0 632   0.064
257954 555 4.560 4.250 6.135 9.780 1.520 9.0 8.6 8.3 -20.0 CALL M 0.094
257955 565 4.600 4.250 6.135 9.780 1.520 9.2 8.8 8.5 -20.0 670   0.134
257956 509 4.500 4.000 6.135 9.780 1.645 8.8 8.4 8.1 -11.5 661   0.034
257957 515 4.530 4.000 6.135 9.780 1.645 8.9 8.5 8.2 -11.5 674   0.064

Did you know? - we also offer a complete line of pistons for this particular application in our SRP product line? Click here to check them out.
 

- Denotes part # has been issued a new part #. A list referencing old part #s to their new counterparts will be available shortly.

JE Pistons 15312 Connector Lane - Huntington Beach, CA 92649 - Sales/Technical Assistance | Careers @ JE
JE and SRP Pistons are Exclusive NASCAR Performance Products
NASCAR® and NASCAR Performance® are registered trademarks of the National Association for Stock Car Auto Racing, Inc
Copyright 2002-2007 JE Pistons. All Rights Reserved.