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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 # CID Bore Stroke Rod
Lgth.		 Block
Ht.		 Comp.
Ht.
Head Cubic Centimeters
110cc 118cc 124cc
Compression Ratio
Dome
Vol.		 Gram
Wt.		 Footnote Oversize Recom.
Ring Set
257942 540 4.500 4.250 6.385 9.780 1.270 8.8 8.4 8.1 -20.0 569 B 0.034 J100F8-4500-5
257951 540 4.500 4.250 6.135 9.780 1.520 8.8 8.4 8.1 -20.0 626 0.034 J100F8-4500-5
257953 548 4.530 4.250 6.135 9.780 1.520 8.9 8.5 8.2 -20.0 632 0.064 J100F8-4530-5
257943 548 4.530 4.250 6.385 9.780 1.270 8.9 8.5 8.2 -20.0 611 B 0.064 J100F8-4530-5
257944 555 4.560 4.250 6.385 9.780 1.270 9.0 8.6 8.3 -20.0 591 B 0.094 J100S8-4560-5
257954 555 4.560 4.250 6.135 9.780 1.520 9.0 8.6 8.3 -20.0 CALL M 0.094 J100S8-4560-5
257955 565 4.600 4.250 6.135 9.780 1.520 9.2 8.8 8.5 -20.0 670 0.134 J100L8-4600-5
257945 565 4.600 4.250 6.385 9.780 1.270 9.2 8.8 8.5 -20.0 608 B 0.134 J100L8-4600-5
257946 467 4.310 4.000 6.385 9.780 1.395 8.0 7.6 7.4 -14.5 576 B 0.060 J100F8-4310-5
257947 509 4.500 4.000 6.385 9.780 1.395 8.0 7.6 7.4 -28.0 586 B 0.034 J100F8-4500-5
257956 509 4.500 4.000 6.135 9.780 1.645 8.8 8.4 8.1 -11.5 661 0.034 J100F8-4500-5
257948 516 4.530 4.000 6.385 9.780 1.395 8.1 7.7 7.5 -28.0 597 B 0.064 J100F8-4530-5
257957 515 4.530 4.000 6.135 9.780 1.645 8.9 8.5 8.2 -11.5 674 0.064 J100F8-4530-5
257949 523 4.560 4.000 6.385 9.780 1.395 8.2 7.8 7.5 -28.0 610 B 0.094 J100S8-4560-5
257950 532 4.600 4.000 6.385 9.780 1.395 8.3 7.9 7.7 -28.0 627 B 0.134 J100L8-4600-5

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

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