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BIG BLOCK FLAT TOP - TALL DECK

These big block pistons are compatible with forced induction or nitrous (EXCEPT 1.120 CD). Valve reliefs will accommodate oversized valves and long duration, tight lobe separation cams. Compression Height figured using either 10.180" or 10.195" 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, including angle milled versions.

Includes:
Pin #990-2930-15-51S (150g) - 1.120" CD
Pin #990-2930-18-51S (174g) - 1.245" CD and above
Double spiro locks (#990-042-CS)
BIG BLOCK CHEVY FLAT TOP 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
338236 604 4.500 4.750 6.700 10.195 1.120 11.1 10.4 10.0 -3.0 NEW B,M,U 0.034 J100F8-4500-5
338237 612 4.530 4.750 6.700 10.195 1.120 11.2 10.5 10.1 -3.0 NEW B,M,U 0.064 J100F8-4530-5
338238 621 4.560 4.750 6.700 10.195 1.120 11.3 10.6 10.2 -3.0 NEW B,M,U 0.094 J100S8-4560-5
281959 632 4.600 4.750 6.700 10.195 1.120 11.4 10.7 10.3 -3.0 589 B,U 0.134 J100U8-4600-5
281960 634 4.610 4.750 6.700 10.195 1.120 11.4 10.8 10.4 -3.0 590 B,U 0.144 J100H8-4610-5
281961 638 4.625 4.750 6.700 10.195 1.120 11.5 10.8 10.4 -3.0 597 M,B,U 0.159 J100F8-4625-5
257969 518 4.280 4.500 6.535 10.180 1.395 9.6 9.1 8.7 -3.0 574 0.030 J100F8-4280-5
257970 525 4.310 4.500 6.535 10.180 1.395 9.7 9.2 8.8 -3.0 580 0.060 J100F8-4310-5
257960 525 4.310 4.500 6.700 10.195 1.245 9.7 9.2 8.8 -3.0 560 B 0.060 J100F8-4310-5
257961 572 4.500 4.500 6.700 10.195 1.245 10.4 9.9 9.5 -3.0 614 B 0.034 J100F8-4500-5
257971 572 4.500 4.500 6.535 10.180 1.395 10.4 9.9 9.5 -3.0 637 0.034 J100F8-4500-5
257972 580 4.530 4.500 6.535 10.180 1.395 10.7 10.1 9.7 -3.0 652 0.064 J100F8-4530-5
257973 587 4.560 4.500 6.535 10.180 1.395 10.8 10.2 9.8 -3.0 670 0.094 J100S8-4560-5
257962 588 4.560 4.500 6.700 10.195 1.245 10.7 10.1 9.7 -3.0 634 B,M 0.094 J100S8-4560-5
257963 598 4.600 4.500 6.700 10.195 1.245 10.9 10.3 9.9 -3.0 637 B 0.134 J100L8-4600-5
282042 598 4.600 4.500 6.535 10.180 1.395 10.9 10.3 9.9 -3.0 680 0.134 J100L8-4600-5
282043 601 4.610 4.500 6.535 10.180 1.395 10.9 10.3 9.9 -3.0 682 M 0.144 J100H8-4610-5
282044 605 4.625 4.500 6.535 10.180 1.395 11.0 10.4 9.9 -3.0 687 M 0.159 J100F8-4625-5
257977 489 4.280 4.250 6.535 10.180 1.520 9.1 8.6 8.3 -3.0 595 M 0.030 J100F8-4280-5
257974 496 4.310 4.250 6.535 10.180 1.520 9.2 8.7 8.4 -3.0 611 0.060 J100F8-4310-5
257975 541 4.500 4.250 6.535 10.180 1.520 9.9 9.4 9.0 -3.0 667 0.034 J100F8-4500-5
257976 548 4.530 4.250 6.535 10.180 1.520 10.1 9.6 9.2 -3.0 681 M 0.064 J100F8-4530-5
257978 555 4.560 4.250 6.535 10.180 1.520 10.2 9.7 9.3 -3.0 686 M 0.094 J100S8-4560-5

- 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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