Big Block Chevy -2.9cc Flat Top 4.280 bore 4.250 stroke 6.385 rod, 8.4 to 1 with 118cc head (CP Bullets BBC5010-030)
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|
Make |
Chevrolet |
|
Engine Type |
Big Block |
|
Part Number |
BBC5010-030 |
|
Bore (in) |
4.28 |
|
Stroke (in) |
4.25 |
|
Rod Length (in) |
6.385 |
|
Comp Height |
1.275 |
|
Head Type |
24 OC |
|
Head CC |
118 |
|
Dome / Dish Height |
FT |
|
Dom/Dish CC |
-2.9 |
|
Compression Ratio |
8.4 |
|
Pin |
.990 x 2.750 |
|
Ring Thickness |
1/16 x 1/16 x 3/16 in. |
|
VR Depth |
-0.29 |
|
Cubic Inch |
489 |
|
Piston Weight |
569 |
|
Style |
FT |
|
Valve Reliefs |
1 VR with Slant |
|
Gas Port |
No |
| Product Name | Big Block Chevy -2.9cc Flat Top 4.280 bore 4.250 stroke 6.385 rod, 8.4 to 1 with 118cc head (CP Bullets BBC5010-030) |
|---|---|
| Brands | CP Carrillo |
| Engine | Big Block 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 bore clearance for the BBC5010-030 pistons?
For the BBC5010-030 pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. However, final clearance should be determined by the engine builder based on the specific application and operating conditions.
What compression ratio can I expect with these pistons and a 118cc head?
These pistons yield a compression ratio of approximately 8.4:1 when used with a 118cc head. Keep in mind that actual compression may vary based on head gasket thickness and any machining done to the block or heads.
What type of ring set is compatible with the BBC5010-030 pistons?
The BBC5010-030 pistons are designed to work with a 1/16 x 1/16 x 3/16 inch ring set. Ensure that the rings are properly gapped according to your specific engine requirements.
Do I need to modify the pistons for valve clearance?
The BBC5010-030 pistons feature a single valve relief with a slant, which should provide adequate clearance for most applications. However, it is advisable to check valve-to-piston clearance during assembly, especially with high-lift camshafts.
What is the weight of the BBC5010-030 pistons and how does it affect performance?
The BBC5010-030 pistons weigh 569 grams each. Lighter pistons can improve engine response and reduce stress on the connecting rods, but ensure that your rotating assembly is balanced to maintain reliability and performance.
