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BBC Lightweight FSR Nitrous Series GP (Gas Ported)

Our new F.S.R. hollow dome GP (Gas Ported) was specifically designed for circle track and drag racing applications. Up to 100 grams lighter than traditional full round (including wrist pin and rings), but stronger and more durable due to modern FEA-designed forging. Deeper valve pockets to accommodate higher lift cams and milled cylinder heads. Accepts low friction .043/.043/3.0mm ring package. Dome configuration designed to accommodate most popular open chamber cylinder heads, including Brodix Head Hunter with up to 2.400" diameter intake valves.

Includes:
3D Undercrown Milling for max weight reduction
Pin #990-2500-18-51C (151g)
Wire Locks 990-073-MW
Lateral gas ports
Accumulator grooves
Contact reduction grooves

BBC Lightweight FSR Nitrous Series GP (Gas Ported)
Features 3D undercrown milling for max weight reduction!
Std Bore: 4.466
Ring packaged designed for: .043", .043", 3.0mm rings.
Dome configuration designed to accommodate most popular open chamber cylinder heads, including Brodix Head Hunter with up to 2.400" diameter intake valves.

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
110 118 124
Compression Ratio
Dome
Vol.
Gram
Wt.
Footnote Oversize Recom.
Ring Set
330126 604 4.500 4.750 6.700 10.195 1.120 16.6 15.2 14.3 42 Call B,M 0.034 JG7708-4500-5
330162 604 4.500 4.750 6.700 10.195 1.120 18.1 16.4 15.4 49 637 B,M 0.034 JG7708-4500-5
330127 612 4.530 4.750 6.700 10.195 1.120 16.8 15.4 14.7 42 Call B,M 0.064 JG7708-4530-5
330163 612 4.530 4.750 6.700 10.195 1.120 18.3 16.6 15.5 49 Call B,M 0.064 JG7708-4530-5
330128 621 4.560 4.750 6.700 10.195 1.120 17.0 15.5 14.6 42 Call B 0.094 JG7708-4560-5
330164 621 4.560 4.750 6.700 10.195 1.120 18.5 16.8 15.7 49 Call B 0.094 JG7708-4560-5
330129 632 4.600 4.750 6.700 10.195 1.120 17.2 15.8 14.8 42 650 B 0.134 JG7708-4600-5
330165 632 4.600 4.750 6.700 10.195 1.120 18.8 17.0 15.9 49 671 B 0.134 JG7708-4600-5
330130 634 4.610 4.750 6.700 10.195 1.120 17.3 15.8 14.9 42 Call B 0.144 JG7708-4610-5
330166 634 4.610 4.750 6.700 10.195 1.120 18.9 17.1 16.0 49 Call B 0.144 JG7708-4610-5
330131 638 4.625 4.750 6.700 10.195 1.120 17.4 15.9 14.9 42 Call B,M 0.159 JG7708-4625-5
330167 638 4.625 4.750 6.700 10.195 1.120 19.0 17.2 16.1 49 Call B,M 0.159 JG7708-4625-5
330156 588 4.500 4.625 6.800 10.173 1.060 17.7 16.0 15.0 49 Call B,M 0.034 JG7708-4500-5
330157 596 4.530 4.625 6.800 10.173 1.060 17.9 16.2 15.1 49 632 B,M 0.064 JG7708-4530-5
330158 604 4.560 4.625 6.800 10.173 1.060 18.1 16.4 15.3 49 Call B 0.094 JG7708-4560-5
330159 615 4.600 4.625 6.800 10.173 1.060 18.3 16.6 15.5 49 Call B 0.134 JG7708-4600-5
330160 618 4.610 4.625 6.800 10.173 1.060 18.4 16.7 15.6 49 657 B 0.144 JG7708-4610-5
330161 622 4.625 4.625 6.800 10.173 1.060 18.5 16.8 15.7 49 Call B,M 0.159 JG7708-4625-5
330126 573 4.500 4.500 6.800 10.170 1.120 15.8 14.5 13.6 42 Call B,M 0.034 JG7708-4500-5
330132 573 4.500 4.500 6.385 9.790 1.155 16.2 14.8 13.9 44 Call B,M 0.034 JG7708-4500-5
330162 573 4.500 4.500 6.800 10.170 1.120 17.2 15.6 14.6 49 637 B,M 0.034 JG7708-4500-5
330127 580 4.530 4.500 6.800 10.170 1.120 16.0 14.6 13.7 42 Call B,M 0.064 JG7708-4530-5
330133 580 4.530 4.500 6.385 9.790 1.155 16.4 14.9 14.0 44 Call B,M 0.064 JG7708-4530-5
330163 580 4.530 4.500 6.800 10.170 1.120 17.4 15.8 14.8 49 Call B,M 0.064 JG7708-4530-5
330128 588 4.560 4.500 6.800 10.170 1.120 16.1 14.8 13.9 42 Call B 0.094 JG7708-4560-5
330134 588 4.560 4.500 6.385 9.790 1.155 16.5 15.1 14.2 44 Call B 0.094 JG7708-4560-5
330164 588 4.560 4.500 6.800 10.170 1.120 17.6 16.0 14.9 49 Call B 0.094 JG7708-4560-5
330129 598 4.600 4.500 6.800 10.170 1.120 16.4 15.0 14.1 42 650 B 0.134 JG7708-4600-5
330135 598 4.600 4.500 6.385 9.790 1.155 16.8 15.3 14.4 44 Call B 0.134 JG7708-4600-5
330165 598 4.600 4.500 6.800 10.170 1.120 17.9 16.2 15.1 49 671 B 0.134 JG7708-4600-5
330130 601 4.610 4.500 6.800 10.170 1.120 16.4 15.0 14.1 42 Call B 0.144 JG7708-4610-5
330136 601 4.610 4.500 6.385 9.790 1.155 16.8 15.4 14.4 44 675 B 0.144 JG7708-4610-5
330166 601 4.610 4.500 6.800 10.170 1.120 17.9 16.2 15.2 49 Call B 0.144 JG7708-4610-5
330131 605 4.625 4.500 6.800 10.170 1.120 16.5 15.1 14.2 42 Call B,M 0.159 JG7708-4625-5
330137 605 4.625 4.500 6.385 9.790 1.155 16.9 15.4 14.5 44 Call B,M 0.159 JG7708-4625-5
330167 605 4.625 4.500 6.800 10.170 1.120 18.0 16.3 15.3 49 Call B,M 0.159 JG7708-4625-5
330138 557 4.500 4.375 6.385 9.788 1.215 15.0 13.8 13.0 40 Call B,M 0.034 JG7708-4500-5
330120 557 4.500 4.375 6.535 9.783 1.060 15.0 13.8 13.0 40 599 B,M 0.034 JG7708-4500-5
330126 557 4.500 4.375 6.480 9.788 1.120 15.4 14.1 13.2 42 Call B,M 0.034 JG7708-4500-5
330168 557 4.500 4.375 6.385 9.788 1.215 16.8 15.2 14.2 49 Call B,M 0.034 JG7708-4500-5
330156 557 4.500 4.375 6.535 9.783 1.060 16.8 15.2 14.2 49 Call B,M 0.034 JG7708-4500-5
330162 557 4.500 4.375 6.480 9.788 1.120 16.8 15.2 14.2 49 637 B,M 0.034 JG7708-4500-5
330121 564 4.530 4.375 6.535 9.783 1.060 15.2 13.9 13.1 40 Call B,M 0.064 JG7708-4530-5
330139 564 4.530 4.375 6.385 9.788 1.215 15.2 13.9 13.1 40 654 B,M 0.064 JG7708-4530-5
330127 564 4.530 4.375 6.480 9.788 1.120 15.6 14.3 13.4 42 Call B,M 0.064 JG7708-4530-5
330169 564 4.530 4.375 6.385 9.788 1.215 17.0 15.4 14.4 49 Call B,M 0.064 JG7708-4530-5
330163 564 4.530 4.375 6.480 9.788 1.120 17.0 15.4 14.4 49 Call B,M 0.064 JG7708-4530-5
330157 564 4.530 4.375 6.535 9.783 1.060 17.0 15.4 14.4 49 632 B,M 0.064 JG7708-4530-5
330122 572 4.560 4.375 6.535 9.783 1.060 15.4 14.1 13.3 40 Call B 0.094 JG7708-4560-5
330140 572 4.560 4.375 6.385 9.788 1.215 15.4 14.1 13.3 40 Call B 0.094 JG7708-4560-5
330128 572 4.560 4.375 6.480 9.788 1.120 15.7 14.4 13.5 42 Call B 0.094 JG7708-4560-5
330170 572 4.560 4.375 6.385 9.788 1.215 17.2 15.5 14.5 49 687 B 0.094 JG7708-4560-5
330158 572 4.560 4.375 6.535 9.783 1.060 17.2 15.5 14.5 49 Call B 0.094 JG7708-4560-5
330164 572 4.560 4.375 6.480 9.788 1.120 17.2 15.5 14.5 49 Call B 0.094 JG7708-4560-5
330123 582 4.600 4.375 6.535 9.783 1.060 15.6 14.3 13.5 40 Call B 0.134 JG7708-4600-5
330141 582 4.600 4.375 6.385 9.788 1.215 15.6 14.3 13.5 40 Call B 0.134 JG7708-4600-5
330129 582 4.600 4.375 6.480 9.788 1.120 16.0 14.6 13.7 42 650 B 0.134 JG7708-4600-5
330171 582 4.600 4.375 6.385 9.788 1.215 17.4 15.8 14.7 49 Call B 0.134 JG7708-4600-5
330165 582 4.600 4.375 6.480 9.788 1.120 17.4 15.8 14.7 49 671 B 0.134 JG7708-4600-5
330159 582 4.600 4.375 6.535 9.783 1.060 17.4 15.8 14.7 49 Call B 0.134 JG7708-4600-5
330124 584 4.610 4.375 6.535 9.783 1.060 15.6 14.3 13.5 40 Call B 0.144 JG7708-4610-5
330142 584 4.610 4.375 6.385 9.788 1.215 15.6 14.3 13.5 40 681 B 0.144 JG7708-4610-5
330130 584 4.610 4.375 6.480 9.788 1.120 16.0 14.6 13.8 42 Call B 0.144 JG7708-4610-5
330172 584 4.610 4.375 6.385 9.788 1.215 17.5 15.8 14.8 49 Call B 0.144 JG7708-4610-5
330160 584 4.610 4.375 6.535 9.783 1.060 17.5 15.8 14.8 49 657 B 0.144 JG7708-4610-5
330166 584 4.610 4.375 6.480 9.788 1.120 17.5 15.8 14.8 49 Call B 0.144 JG7708-4610-5
330125 588 4.625 4.375 6.535 9.783 1.060 15.7 14.4 13.5 40 639 B,M 0.159 JG7708-4625-5
330143 588 4.625 4.375 6.385 9.788 1.215 15.7 14.4 13.6 40 Call B,M 0.159 JG7708-4625-5
330131 588 4.625 4.375 6.480 9.788 1.120 16.1 14.7 13.9 42 Call B,M 0.159 JG7708-4625-5
330173 588 4.625 4.375 6.385 9.788 1.215 17.5 15.9 14.9 49 710 B,M 0.159 JG7708-4625-5
330167 588 4.625 4.375 6.480 9.788 1.120 17.5 15.9 14.9 49 Call B,M 0.159 JG7708-4625-5
330161 588 4.625 4.375 6.535 9.783 1.060 17.5 15.9 14.9 49 Call B,M 0.159 JG7708-4625-5
330126 541 4.500 4.250 6.535 9.780 1.120 15.0 13.7 12.9 42 Call B,M 0.034 JG7708-4500-5
330150 541 4.500 4.250 6.385 9.780 1.270 14.8 13.5 12.7 46 Call B,M 0.034 JG7708-4500-5
330150 541 4.500 4.250 6.800 10.195 1.270 14.8 13.5 12.7 46 Call B,M 0.034 JG7708-4500-5
330162 541 4.500 4.250 6.535 9.780 1.120 16.3 14.8 13.8 49 637 B,M 0.034 JG7708-4500-5
330174 541 4.500 4.250 6.385 9.780 1.270 16.3 14.8 13.8 49 683 B,M 0.034 JG7708-4500-5
330174 541 4.500 4.250 6.800 10.195 1.270 16.3 14.8 13.8 49 683 B,M 0.034 JG7708-4500-5
330127 548 4.530 4.250 6.535 9.780 1.120 15.1 13.9 13.0 42 Call B,M 0.064 JG7708-4530-5
330151 548 4.530 4.250 6.800 10.195 1.270 15.0 13.7 12.8 46 Call B,M 0.064 JG7708-4530-5
330151 548 4.530 4.250 6.385 9.780 1.270 15.0 13.7 12.8 46 Call B,M 0.064 JG7708-4530-5
330163 548 4.530 4.250 6.535 9.780 1.120 16.5 15.0 14.0 49 Call B,M 0.064 JG7708-4530-5
330175 548 4.530 4.250 6.385 9.780 1.270 16.5 15.0 14.0 49 Call B,M 0.064 JG7708-4530-5
330175 548 4.530 4.250 6.800 10.195 1.270 16.5 15.0 14.0 49 Call B,M 0.064 JG7708-4530-5
330128 555 4.560 4.250 6.535 9.780 1.120 15.3 14.0 13.2 42 Call B 0.094 JG7708-4560-5
330152 555 4.560 4.250 6.385 9.780 1.270 15.2 13.8 13.0 46 695 B 0.094 JG7708-4560-5
330152 555 4.560 4.250 6.800 10.195 1.270 15.2 13.8 13.0 46 695 B 0.094 JG7708-4560-5
330164 555 4.560 4.250 6.535 9.780 1.120 16.7 15.1 14.1 49 Call B 0.094 JG7708-4560-5
330176 555 4.560 4.250 6.385 9.780 1.270 16.7 15.1 14.1 49 Call B 0.094 JG7708-4560-5
330176 555 4.560 4.250 6.800 10.195 1.270 16.7 15.1 14.1 49 Call B 0.094 JG7708-4560-5
330129 565 4.600 4.250 6.535 9.780 1.120 15.5 14.2 13.4 42 650 B 0.134 JG7708-4600-5
330153 565 4.600 4.250 6.800 10.195 1.270 15.4 14.0 13.1 46 Call B 0.134 JG7708-4600-5
330153 565 4.600 4.250 6.385 9.780 1.270 15.4 14.0 13.1 46 Call B 0.134 JG7708-4600-5
330165 565 4.600 4.250 6.535 9.780 1.120 16.9 15.3 14.4 49 671 B 0.134 JG7708-4600-5
330177 565 4.600 4.250 6.385 9.780 1.270 16.9 15.3 14.4 49 718 B 0.134 JG7708-4600-5
330177 565 4.600 4.250 6.800 10.195 1.270 16.9 15.3 14.4 49 718 B 0.134 JG7708-4600-5
330130 568 4.610 4.250 6.535 9.780 1.120 15.6 14.3 13.4 42 Call B 0.144 JG7708-4610-5
330154 568 4.610 4.250 6.385 9.780 1.270 15.4 14.1 13.2 46 713 B 0.144 JG7708-4610-5
330154 568 4.610 4.250 6.800 10.195 1.270 15.4 14.1 13.2 46 713 B 0.144 JG7708-4610-5
330166 568 4.610 4.250 6.535 9.780 1.120 17.0 15.4 14.4 49 Call B 0.144 JG7708-4610-5
330178 568 4.610 4.250 6.385 9.780 1.270 17.0 15.4 14.4 49 Call B 0.144 JG7708-4610-5
330178 568 4.610 4.250 6.800 10.195 1.270 17.0 15.4 14.4 49 Call B 0.144 JG7708-4610-5
330131 571 4.625 4.250 6.535 9.780 1.120 15.7 14.3 13.5 42 Call B,M 0.159 JG7708-4625-5
330155 571 4.625 4.250 6.800 10.195 1.270 15.5 14.1 13.3 46 Call B,M 0.159 JG7708-4625-5
330155 571 4.625 4.250 6.385 9.780 1.270 15.5 14.1 13.3 46 Call B,M 0.159 JG7708-4625-5
330167 571 4.625 4.250 6.535 9.780 1.120 17.1 15.5 14.5 49 Call B,M 0.159 JG7708-4625-5
330179 571 4.625 4.250 6.385 9.780 1.270 17.1 15.5 14.5 49 Call B,M 0.159 JG7708-4625-5
330179 571 4.625 4.250 6.800 10.195 1.270 17.1 15.5 14.5 49 Call B,M 0.159 JG7708-4625-5
330144 509 4.500 4.000 6.535 9.780 1.245 14.9 13.5 12.7 46 Call B,M 0.034 JG7708-4500-5
330145 516 4.530 4.000 6.535 9.780 1.245 15.0 13.7 12.8 46 Call B,M 0.064 JG7708-4530-5
330146 523 4.560 4.000 6.535 9.780 1.245 15.2 13.8 13.0 46 Call B 0.094 JG7708-4560-5
330147 532 4.600 4.000 6.535 9.780 1.245 15.4 14.0 13.1 46 699 B 0.134 JG7708-4600-5
330148 534 4.610 4.000 6.535 9.780 1.245 15.4 14.1 13.2 46 Call B 0.144 JG7708-4610-5
330149 538 4.625 4.000 6.535 9.780 1.245 15.5 14.1 13.3 46 Call B,M 0.159 JG7708-4625-5

- 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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