Chevy BB 489ci O.C. Bore 4.280 CH 1.270 Stroke 4.250 Rod 6.385 CR +18cc Dome 118 Head (CP Bullets BBC5107-030)
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|
Make |
Chevrolet |
|
Engine Type |
Big Block |
|
Part Number |
BBC5107-030 |
|
Bore (in) |
4.28 |
|
Stroke (in) |
4.25 |
|
Rod Length (in) |
6.385 |
|
Comp Height |
1.27 |
|
Head Type |
24 OC |
|
Head CC |
118 |
|
Dome / Dish Height |
0.18 |
|
Dom/Dish CC |
18 |
|
Compression Ratio |
9.7 |
|
Pin |
.990 x 2.750 |
|
Ring Thickness |
1/16 x 1/16 x 3/16 in. |
|
VR Depth |
-0.295 |
|
Cubic Inch |
489 |
|
Piston Weight |
564 |
|
Style |
Dome |
|
Valve Reliefs |
1 VR with Slant |
|
Gas Port |
No |
| Product Name | Chevy BB 489ci O.C. Bore 4.280 CH 1.270 Stroke 4.250 Rod 6.385 CR +18cc Dome 118 Head (CP Bullets BBC5107-030) |
|---|---|
| Brands | CP Carrillo |
| Engine | Chev |
| Make | GM |
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What information do I need to match these pistons to my engine?
You need the engine code, bore size, stroke, rod length, pin diameter and target compression ratio. These determine the correct piston compression height and crown design.
How should ring gaps be set for these pistons?
Ring gaps must be set by your engine builder based on fuel type, boost level and the intended rpm range. Forced-induction engines usually require larger gaps.
Are forged pistons suitable for street engines?
Yes. Forged pistons handle detonation and high cylinder pressure better than cast units. Your builder should set the piston-to-bore clearance to suit your application.
What is the recommended compression ratio for the BBC5107-030 pistons?
The BBC5107-030 pistons are designed to achieve a compression ratio of approximately 9.7:1 when used with 118cc cylinder heads. However, the actual compression ratio may vary based on the specific engine build and machining tolerances.
What bore and stroke specifications are compatible with the BBC5107-030 pistons?
These pistons are designed for a bore of 4.280 inches and a stroke of 4.250 inches, making them suitable for a 489 cubic inch Big Block Chevrolet engine.
What type of valve reliefs do the BBC5107-030 pistons feature?
The BBC5107-030 pistons come with one valve relief that has a slant design, which helps accommodate the valve train without compromising piston strength.
What is the weight of the BBC5107-030 pistons?
Each BBC5107-030 piston weighs approximately 564 grams. It's important to consider this weight when balancing the rotating assembly for optimal performance.
What is the pin size and length for the BBC5107-030 pistons?
The BBC5107-030 pistons feature a pin size of 0.990 inches and a length of 2.750 inches. Ensure that your connecting rods are compatible with these specifications for proper fitment.
