Forged high compression BBC dome top open chamber pistons from ROSS Racing Pistons are the favorite choice of many high performance and racing engine builders. The Ross BBC pistons listed on this page are made specifically for use with open chamber heads. Ross forged pistons incorporate unique design features to provide high strength and take advantage of precision machining and premium materials to build a forged piston you can depend on. Ross big block Chevy high compression open chamber pistons give improved torque, horsepower, efficiency and reliability. We offer discounted pricing, tech help if you need assistance, and fast shipping on the entire Ross Racing Pistons product line..
ROSS pistons feature forced pin oilers when applicable, anti detonation grooves, lock removal grooves and come complete with wrist pin retention lock rings. The pistons are pin fit and balanced to plus or minus 2.5 grams throughout the set. Intake and, or exhaust valve pockets are radius machined and designed to handle most common performance camshaft applications. The precision skirt design allows the pistons to work properly under intense combustion heat and tremendous side loads without scuffing or splitting cylinder walls.
High Compression Big Block Chevy Pistons for use with Open Chamber Heads
 ROSS high compression
BBC pistons listed in this section feature special hollow dome forgings for
maximum strength with minimum weight. Designed for use with open chamber heads. These pistons are designed for intake
valves up to 2.300" diameter and exhaust valves up to 2.050" diameter. Suitable for
nitrous systems of 250 horsepower or less. Pins included are 5115 series straight wall .990 diameter, aircraft quality and are retained by double spiro lox or can
be press fitted into rods. Compression ratio for these pistons is based on the cylinder head chamber volumes as listed in the chart below and .050 piston to
head clearance (deck and gasket combined). Ring grooves are 1/16, 1/16, 3/16
- BLOCK HEIGHT 9.800
- COMPRESSION RATIO Based on .050 piston to head clearance (deck and gasket combined)
- FORCED INDUCTION No
- NITROUS Yes up to 250hp shot
- Ring Grooves 1/16 1/16 3/16
- APPLICATIONS Street, Drag Racing, Marine (optional taper bore pins recommended for high horsepower applications)
- WHAT’S INCLUDED 8 forged pistons, 8 Wrist Pins ( .990 5115 Series steel straight wall) and 32 pin retention locks
- PISTON RINGS Are sold separately Piston rings listed are plasma moly, file fit with standard tension oil rings
|
| Bore |
Stroke |
Rod
Length |
C.H. |
Dome
cc |
Dome Ht |
Compression Ratio with Head cc of: |
Weight |
Piston Ring Set |
Piston Set |
| 109 |
118 |
124 |
| 4.280 |
4.000 |
6.135 |
1.648 |
51 |
0.7 |
14.5 |
13 |
12.1 |
631 |
RS-9745-35
$231.05 $229.89
 |
|
83062
|
| 4.280 |
4.000 |
6.385 |
1.398 |
51 |
0.7 |
14.5 |
13 |
12.1 |
595 |
83032
|
| 4.280 |
4.000 |
6.535 |
1.245 |
51 |
0.7 |
14.5 |
13 |
12.1 |
561 |
99549 *
|
| 4.280 |
4.250 |
6.135 |
1.523 |
51 |
0.7 |
15.4 |
13.7 |
12.8 |
593 |
83462
|
| 4.280 |
4.250 |
6.385 |
1.273 |
51 |
0.7 |
15.4 |
13.7 |
12.8 |
566 |
83432 *
|
| 4.280 |
4.250 |
6.535 |
1.12 |
51 |
0.7 |
15.4 |
13.7 |
12.8 |
529 |
99546 *
|
| 4.310 |
4.000 |
6.135 |
1.635 |
51 |
0.7 |
14.7 |
13.1 |
12.3 |
647 |
RS-9745-65
$231.05 $229.89
|
|
80001
|
| 4.310 |
4.000 |
6.135 |
1.648 |
51 |
0.7 |
14.7 |
13.1 |
12.3 |
653 |
86062
|
| 4.310 |
4.000 |
6.385 |
1.398 |
51 |
0.7 |
14.7 |
13.1 |
12.3 |
602 |
86032
|
| 4.310 |
4.000 |
6.535 |
1.245 |
51 |
0.7 |
14.7 |
13.1 |
12.3 |
559 |
99550 *
|
| 4.310 |
4.250 |
6.135 |
1.523 |
50 |
0.64 |
15.3 |
13.7 |
12.8 |
611 |
86462
|
| 4.310 |
4.250 |
6.385 |
1.273 |
50 |
0.64 |
15.3 |
13.7 |
12.8 |
565 |
99510 *
|
| 4.310 |
4.250 |
6.535 |
1.12 |
51 |
0.7 |
15.5 |
13.9 |
13 |
531 |
99547 *
|
| 4.320 |
3.760 |
6.135 |
1.768 |
51 |
0.7 |
13.9 |
12.4 |
11.6 |
664 |
RS-9798-05
$219.95 $218.85
|
|
99554
|
| 4.320 |
4.000 |
6.535 |
1.245 |
51 |
0.7 |
14.7 |
13.2 |
12.3 |
561 |
99551 *
|
| 4.350 |
3.760 |
6.135 |
1.768 |
51 |
0.7 |
14 |
12.6 |
11.8 |
574 |
RS-9798-35
$219.95 $218.85
|
|
99555
|
| 4.350 |
4.000 |
6.135 |
1.648 |
51 |
0.7 |
14.9 |
13.3 |
12.4 |
665 |
87062
|
| 4.350 |
4.000 |
6.385 |
1.398 |
51 |
0.7 |
14.9 |
13.3 |
12.4 |
611 |
87432
|
| 4.350 |
4.000 |
6.535 |
1.245 |
51 |
0.7 |
14.9 |
13.3 |
12.4 |
571 |
99552 *
|
| 4.350 |
4.250 |
6.385 |
1.273 |
51 |
0.7 |
15.7 |
14.1 |
13.2 |
595 |
99509 *
|
| 4.350 |
4.250 |
6.535 |
1.12 |
51 |
0.7 |
15.7 |
14.1 |
13.2 |
545 |
99553 *
|
| 4.375 |
4.000 |
6.135 |
1.648 |
51 |
0.7 |
15 |
13.4 |
12.6 |
641 |
RS-9799-05
$219.95 $218.85
|
|
99611
|
| 4.375 |
4.000 |
6.135 |
1.648 |
51 |
0.7 |
15 |
13.4 |
12.6 |
639 |
88062 Discontinued |
| 4.375 |
4.000 |
6.385 |
1.398 |
51 |
0.7 |
15 |
13.4 |
12.6 |
604 |
99623
|
| 4.375 |
4.250 |
6.135 |
1.523 |
49 |
0.6 |
15.5 |
13.9 |
13 |
621 |
99622
|
| 4.375 |
4.250 |
6.385 |
1.273 |
49 |
0.6 |
15.5 |
13.9 |
13 |
580 |
99624 *
|
| 4.500 |
4.000 |
6.135 |
1.648 |
51 |
0.7 |
15.7 |
14 |
13.1 |
643 |
RS-10451-05
$269.95 $268.60
|
|
85062
|
| 4.500 |
4.000 |
6.385 |
1.398 |
51 |
0.7 |
15.7 |
14 |
13.1 |
628 |
85032
|
| 4.500 |
4.250 |
6.135 |
1.523 |
49 |
0.6 |
16.2 |
14.5 |
13.6 |
628 |
85462
|
| 4.500 |
4.250 |
6.385 |
1.273 |
45 |
0.5 |
15.4 |
13.9 |
13 |
577 |
99512
|
| 4.500 |
4.250 |
6.385 |
1.273 |
49 |
0.6 |
16.2 |
14.5 |
13.6 |
589 |
85432 *
|
| 4.530 |
4.000 |
6.135 |
1.648 |
51 |
0.7 |
15.8 |
14.2 |
13.3 |
670 |
RS-10451-35
$269.95 $268.60
|
|
82014
|
| 4.530 |
4.000 |
6.385 |
1.398 |
46.5 |
0.7 |
15 |
13.5 |
12.6 |
642 |
82015
|
| 4.530 |
4.250 |
6.385 |
1.273 |
45 |
0.5 |
15.5 |
14 |
13.2 |
565 |
99513
|
| 4.560 |
4.000 |
6.385 |
1.398 |
49 |
0.7 |
15.6 |
14 |
13.1 |
631 |
RS-10441-05
$269.95 $268.60
|
|
88766
|
| 4.560 |
4.000 |
6.535 |
1.245 |
45 |
0.5 |
14.8 |
13.4 |
12.6 |
594 |
99776 *
|
| 4.560 |
4.250 |
6.385 |
1.273 |
45 |
0.5 |
15.7 |
14.2 |
13.3 |
572 |
99514 |
| 4.560 |
4.250 |
6.385 |
1.273 |
49 |
0.6 |
16.5 |
14.8 |
13.9 |
592 |
88765 * |
| 4.560 |
4.250 |
6.535 |
1.12 |
45 |
0.5 |
14.9 |
13.5 |
12.7 |
552 |
99775 *
|
| 4.600 |
4.000 |
6.535 |
1.245 |
45 |
0.5 |
15 |
13.6 |
12.8 |
607 |
|
99778 *
|
| 4.600 |
4.250 |
6.535 |
1.12 |
45 |
0.5 |
15.9 |
14.4 |
13.5 |
594 |
99777 *
|
| 4.625 |
4.000 |
6.535 |
1.245 |
45 |
0.5 |
15.2 |
13.7 |
12.9 |
618 |
|
99779 *
|
| 4.625 |
4.250 |
6.535 |
1.12 |
45 |
0.5 |
16 |
14.5 |
13.6 |
592 |
99781*
|
| * after the piston part number indicates that oil ring support rails are included in the piston set. |
If you do not see a set of pistons here that meet your needs, we also offer custom forged pistons for most any engine project. Please contact us if you would like to discuss a set of custom pistons and we will be happy to work with you to make sure you get exactly the pistons you need for your engine.
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