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BIG BLOCK INVERTED DOME - TALL DECK

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 10.180" "tall deck" 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

Click here to see matching JE Pro Seal Head Gaskets!

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
257946 525 4.310 4.500 6.535 10.180 1.395 9.0 8.6 8.2 -14.5 582 B 0.060 J100F8-4310-5
257947 572 4.500 4.500 6.535 10.180 1.395 8.9 8.5 8.2 -28.0 591 B 0.034 J100F8-4500-5
257948 580 4.530 4.500 6.535 10.180 1.395 9.0 8.6 8.3 -28.0 600 B 0.064 J100F8-4530-5
257949 587 4.560 4.500 6.535 10.180 1.395 9.1 8.7 8.4 -28.0 610 B 0.094 J100S8-4560-5
257950 598 4.600 4.500 6.535 10.180 1.395 9.2 8.8 8.5 -28.0 625 B 0.134 J100L8-4600-5
281922 601 4.610 4.500 6.535 10.180 1.395 9.2 8.8 8.5 -28.0 633 B 0.144 J100H8-4610-5
281923 605 4.625 4.500 6.535 10.180 1.395 9.3 8.9 8.6 -28.0 634 M,B 0.159 J100F8-4625-5
257951 540 4.500 4.250 6.535 10.180 1.520 8.8 8.4 8.1 -20.0 626 0.034 J100F8-4500-5
257953 548 4.530 4.250 6.535 10.180 1.520 9.0 8.6 8.3 -20.0 632 M 0.064 J100F8-4530-5
257954 555 4.560 4.250 6.535 10.180 1.520 9.1 8.7 8.4 -20.0 647 M 0.094 J100S8-4560-5
257955 565 4.600 4.250 6.535 10.180 1.520 9.2 8.8 8.5 -20.0 662 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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