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OPEN CHAMBER - BBC HIGH COMPRESSION DOME

  • Hollow dome design fits most open chamber STD GM®, Dart®, and Brodix® Heads
  • Forged from Premium 2618 aluminum alloy
  • CNC machined domes with radiused valve reliefs provide optimum flame travel
  • Pin fitting and double spiro locks included
  • 990-2930-150 wall wrist pin (150 grams) included
  • CNC Machined ring grooves accept 1/16, 1/16, 3/16 rings (Rings Sold Seperately)
  • Fits tall deck, when used with .400 long rods.
  • Will not fit GM Signature Series or Edelbrock Cylinder Heads: P/N# 60549, 60559, 61559, 60449, 60459, 61459, 60479, 60499
OPEN CHAMBER - BBC HIGH COMPRESSION DOME
Std Bore: 454 = 4.250, 502 = 4.470
Ring package designed for: 1/16, 1/16, 3/16 Rings

Tech and Installation Tips
Part # CID Bore Stroke Rod
Lgth.
Block
Ht.
Comp.
Ht.
Head Cubic Centimeters
112cc 118cc 124cc
Compression Ratio
Dome
Vol.
Gram
Wt.
Footnote Oversize Recom.
Ring Set
139831 489 4.280 4.250 6.385 9.780 1.270 13.8 12.7 11.8 43cc 574 B 0.030 S100S8-4280-5
139832 496 4.310 4.250 6.385 9.780 1.270 13.8 12.7 11.8 43cc 592 B 0.060 S100S8-4310-5
139542 496 4.310 4.250 6.135 9.780 1.520 13.8 12.9 12.1 43cc 647 M 0.060 S100S8-4310-5
139543 498 4.320 4.250 6.135 9.780 1.520 13.8 12.9 12.1 43cc 652 M 0.070 J100F8-4320-5
139833 498 4.320 4.250 6.385 9.780 1.270 13.8 12.9 12.1 43cc 595 B 0.070 J100F8-4320-5
139834 505 4.350 4.250 6.385 9.780 1.270 14.0 13.1 12.3 43cc 611 B 0.100 S100S8-4350-5
139544 505 4.350 4.250 6.135 9.780 1.520 14.0 13.1 12.3 43cc 664 0.100 S100S8-4350-5
140328 533 4.470 4.250 6.385 9.780 1.270 13.9 12.8 12.0 36cc 609 B,L .STD J100S8-4470-5
140329 540 4.500 4.250 6.385 9.780 1.270 13.9 12.8 12.0 36cc 625 B 0.030 S100S8-4500-5
140341 540 4.500 4.250 6.535 9.780 1.120 13.9 12.8 12.0 36cc 596 B 0.030 S100S8-4500-5
140342 548 4.530 4.250 6.535 9.780 1.120 13.9 12.8 12.0 36cc 611 B 0.060 S100S8-4530-5
140330 548 4.530 4.250 6.385 9.780 1.270 13.8 13.0 12.0 36cc 640 B 0.060 S100S8-4530-5
152156 555 4.560 4.250 6.385 9.780 1.270 13.6 12.8 12.1 33cc 631 B 0.090 S100S8-4560-5
231510 555 4.560 4.250 6.535 9.780 1.120 13.9 12.8 12.0 36cc 632 B 0.090 S100S8-4560-5
152157 565 4.600 4.250 6.385 9.780 1.270 13.8 13.0 12.3 33cc 650 B 0.130 S100S8-4600-5
139530 460 4.280 4.000 6.135 9.780 1.645 13.7 12.8 11.9 48cc 662 0.030 S100S8-4280-5
139835 460 4.280 4.000 6.535 9.780 1.245 13.7 12.8 11.9 48cc 585 B,L 0.030 S100S8-4280-5
139836 466 4.310 4.000 6.535 9.780 1.245 13.7 12.8 11.9 48cc 599 B 0.060 S100S8-4310-5
139531 466 4.310 4.000 6.135 9.780 1.645 13.9 12.9 12.1 48cc 690 0.060 S100S8-4310-5
140685 466 4.310 4.000 6.385 9.780 1.395 13.9 12.9 12.1 48cc 634 0.060 S100S8-4310-5
140686 469 4.320 4.000 6.385 9.780 1.395 13.9 13.0 12.8 48cc 643 0.070 J100F8-4320-5
139532 469 4.320 4.000 6.135 9.780 1.645 13.9 12.9 12.1 48cc 689 0.070 J100F8-4320-5
139837 469 4.320 4.000 6.535 9.780 1.245 13.7 12.8 11.9 48cc 606 B 0.070 J100F8-4320-5
139838 475 4.350 4.000 6.535 9.780 1.245 14.0 13.1 12.3 48cc 621 B 0.100 S100S8-4350-5
139533 475 4.350 4.000 6.135 9.780 1.645 14.1 13.2 12.3 48cc 702 0.100 S100S8-4350-5
140687 475 4.350 4.000 6.385 9.780 1.395 14.1 13.2 12.3 48cc 659 0.100 S100S8-4350-5
139534 502 4.470 4.000 6.135 9.780 1.645 13.7 12.8 12.0 41cc 702 M .STD J100S8-4470-5
139535 508 4.500 4.000 6.135 9.780 1.645 13.8 12.9 12.2 41cc 720 M 0.030 S100S8-4500-5
140682 508 4.500 4.000 6.385 9.780 1.395 14.0 13.1 12.3 41cc 668 0.030 S100S8-4500-5
152159 508 4.500 4.000 6.535 9.780 1.245 13.7 12.8 12.1 41cc 634 B 0.030 S100S8-4500-5
152160 515 4.530 4.000 6.535 9.780 1.245 13.9 12.9 12.0 41cc 650 B,M 0.060 S100S8-4530-5
152161 522 4.560 4.000 6.535 9.780 1.245 13.7 12.8 12.1 39cc 636 B 0.090 S100S8-4560-5
152154 522 4.560 4.000 6.385 9.780 1.395 13.7 12.8 12.1 39cc 672 M 0.090 S100S8-4560-5
152155 531 4.600 4.000 6.385 9.780 1.395 13.9 13.0 12.3 39cc 697 M 0.130 S100S8-4600-5
152162 531 4.600 4.000 6.535 9.780 1.245 13.9 13.0 12.3 39cc 655 B 0.130 S100S8-4600-5

- 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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