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BIG BLOCK FLAT TOP

These big block pistons are compatible with forced induction, nitrous and angle milled heads. 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 FLAT TOP 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
257977 489 4.280 4.250 6.135 9.780 1.520 9.1 8.6 8.3 -3.0 595 M 0.030 J100F8-4280-5
257974 496 4.310 4.250 6.135 9.780 1.520 9.2 8.7 8.4 -3.0 611 0.060 J100F8-4310-5
257964 496 4.310 4.250 6.385 9.780 1.270 9.2 8.7 8.4 -3.0 558 B 0.060 J100F8-4310-5
257965 540 4.500 4.250 6.385 9.780 1.270 10.0 9.4 9.1 -3.0 617 B 0.034 J100F8-4500-5
257975 540 4.500 4.250 6.135 9.780 1.520 10.0 9.4 9.1 -3.0 667 0.034 J100F8-4500-5
257976 548 4.530 4.250 6.135 9.780 1.520 10.1 9.6 9.2 -3.0 681 M 0.064 J100F8-4530-5
257966 548 4.530 4.250 6.385 9.780 1.270 10.1 9.6 9.2 -3.0 626 B 0.064 J100F8-4530-5
257967 555 4.560 4.250 6.385 9.780 1.270 10.2 9.7 9.3 -3.0 643 B 0.094 J100S8-4560-5
257978 555 4.560 4.250 6.135 9.780 1.520 10.2 9.7 9.3 -3.0 686 0.094 J100S8-4560-5
257968 565 4.600 4.250 6.385 9.780 1.270 10.3 9.8 9.4 -3.0 639 B 0.134 J100L8-4600-5
281959 565 4.600 4.250 6.535 9.780 1.120 10.3 9.7 9.3 -3.0 589 B,U 0.134 J100U8-4600-5
281960 568 4.610 4.250 6.535 9.780 1.120 10.3 9.8 9.4 -3.0 590 B,U 0.144 J100H8-4610-5
282039 588 4.610 4.250 6.385 9.780 1.270 10.3 9.8 9.4 -3.0 648 B 0.144 J100H8-4610-5
282040 571 4.625 4.250 6.385 9.780 1.270 10.4 9.8 9.4 -3.0 654 B 0.159 J100F8-4625-5
281961 571 4.625 4.250 6.535 9.780 1.120 10.4 9.8 9.4 -3.0 597 B,U,M 0.159 J100F8-4625-5
257979 455 4.255 4.000 6.135 9.775 1.640 8.6 8.1 7.8 -3.0 605 M 0.005 J100F8-4250-5
257980 460 4.280 4.000 6.135 9.775 1.640 8.7 8.2 7.9 -3.0 618 0.030 J100F8-4280-5
257969 460 4.280 4.000 6.385 9.780 1.395 8.7 8.2 7.9 -3.0 574 0.030 J100F8-4280-5
257970 467 4.310 4.000 6.385 9.780 1.395 8.8 8.3 8.0 -3.0 580 0.060 J100F8-4310-5
257981 467 4.310 4.000 6.135 9.775 1.640 8.8 8.3 8.0 -3.0 631 0.060 J100F8-4310-5
257960 467 4.310 4.000 6.535 9.780 1.245 8.8 8.3 8.0 -3.0 560 B,M 0.060 J100F8-4310-5
257983 501 4.466 4.000 6.135 9.780 1.645 9.3 8.8 8.4 -3.0 682 M 0.000 J100S8-4470-5
257984 509 4.500 4.000 6.135 9.780 1.645 9.5 9.0 8.6 -3.0 690 0.034 J100F8-4500-5
257971 509 4.500 4.000 6.385 9.780 1.395 9.5 9.0 8.6 -3.0 637 0.034 J100F8-4500-5
257961 509 4.500 4.000 6.535 9.780 1.245 9.5 9.0 8.6 -3.0 611 B 0.034 J100F8-4500-5
257972 516 4.530 4.000 6.385 9.780 1.395 9.6 9.1 8.7 -3.0 647 0.064 J100F8-4530-5
257985 515 4.530 4.000 6.135 9.780 1.645 9.6 9.1 8.7 -3.0 702 0.064 J100F8-4530-5
257986 522 4.560 4.000 6.135 9.780 1.645 9.7 9.2 8.8 -3.0 714 0.094 J100H8-4560-5
257973 523 4.560 4.000 6.385 9.780 1.395 9.7 9.2 8.8 -3.0 662 0.094 J100S8-4560-5
257962 522 4.560 4.000 6.535 9.780 1.245 9.7 9.2 8.8 -3.0 634 B,M 0.094 J100S8-4560-5
257963 532 4.600 4.000 6.535 9.780 1.245 9.8 9.2 8.9 -3.0 631 B 0.134 J100L8-4600-5
257987 433 4.280 3.766 6.135 9.783 1.765 8.2 7.8 7.5 -3.0 649 0.030 J100F8-4280-5
257988 439 4.310 3.766 6.135 9.783 1.765 8.3 7.9 7.6 -3.0 653 0.060 J100F8-4310-5
257974 439 4.310 3.766 6.385 9.788 1.520 8.3 7.9 7.6 -3.0 611 0.060 J100F8-4310-5
257989 441 4.320 3.766 6.135 9.783 1.765 8.3 7.9 7.6 -3.0 663 M 0.070 J100F8-4320-5
257975 479 4.500 3.766 6.385 9.788 1.520 9.0 8.5 8.2 -3.0 673 0.034 J100F8-4500-5
257976 486 4.530 3.766 6.385 9.788 1.520 9.1 8.6 8.2 -3.0 381 M 0.064 J100F8-4530-5

- 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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