Big Block Chevy -3.4cc Flat Top 4.500 Bore 4.000 stroke 6.385 rod, 8.6 to 1 with 118cc head (CP Bullets BBC5215-STD)
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|
Make |
Chevrolet |
|
Engine Type |
Big Block |
|
Part Number |
BBC5215-STD |
|
Bore (in) |
4.5 |
|
Stroke (in) |
4 |
|
Rod Length (in) |
6.385 |
|
Comp Height |
1.4 |
|
Head Type |
24 OC |
|
Head CC |
118 |
|
Dome / Dish Height |
FT |
|
Dom/Dish CC |
-3.4 |
|
Compression Ratio |
8.6 |
|
Pin |
.990 x 2.930 |
|
Ring Thickness |
1/16 x 1/16 x 3/16 in. |
|
VR Depth |
-0.31 |
|
Cubic Inch |
509 |
|
Piston Weight |
642 |
|
Style |
FT |
|
Valve Reliefs |
1 VR with Slant |
|
Gas Port |
No |
| Product Name | Big Block Chevy -3.4cc Flat Top 4.500 Bore 4.000 stroke 6.385 rod, 8.6 to 1 with 118cc head (CP Bullets BBC5215-STD) |
|---|---|
| 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 BBC5215-STD pistons?
For the BBC5215-STD pistons, a typical bore clearance of 0.0035" to 0.0045" is recommended. However, this can vary based on your specific engine build and operating conditions, so always consult with your engine builder for precise measurements.
What compression ratio can I expect with the BBC5215-STD pistons and 118cc heads?
The BBC5215-STD pistons are designed to achieve a compression ratio of 8.6:1 when used with 118cc cylinder heads. Keep in mind that actual compression may vary based on factors such as head gasket thickness and combustion chamber modifications.
What type of ring set is compatible with the BBC5215-STD pistons?
The BBC5215-STD 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 engine's specifications for optimal performance.
What is the weight of the BBC5215-STD pistons, and how does it affect my engine?
The BBC5215-STD pistons weigh 642 grams each. This weight can influence engine balance and performance, particularly at high RPMs. It's important to consider the total rotating assembly weight when building your engine.
Are there any specific machining requirements for the BBC5215-STD pistons?
Yes, the BBC5215-STD pistons may require specific machining for proper fitment, including ensuring correct bore size and honing for optimal clearance. Always consult with your engine builder to confirm any machining needs based on your setup.
