Big Block Chevy 24.5cc dome 4.500 Bore 4.000 stroke 6.385 rod, 10.7 to 1 with 118cc head (CP Bullets BBC5312-STD)
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|
Make |
Chevrolet |
|
Engine Type |
Big Block |
|
Part Number |
BBC5312-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 |
0.25 |
|
Dom/Dish CC |
24.5 |
|
Compression Ratio |
10.6 |
|
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 |
667 |
|
Style |
Dome |
|
Valve Reliefs |
1 VR with Slant |
|
Gas Port |
No |
| Product Name | Big Block Chevy 24.5cc dome 4.500 Bore 4.000 stroke 6.385 rod, 10.7 to 1 with 118cc head (CP Bullets BBC5312-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 BBC5312-STD pistons?
For the BBC5312-STD pistons, a typical bore clearance of 0.0035" to 0.0045" is recommended. This ensures proper thermal expansion and prevents piston scuffing. Always verify with your specific engine build and conditions.
What compression ratio can I expect with the BBC5312-STD pistons and a 118cc head?
The BBC5312-STD pistons are designed to achieve a compression ratio of approximately 10.6:1 when used with a 118cc cylinder head. However, actual compression may vary based on factors like head gasket thickness and machining tolerances.
What type of valve reliefs do the BBC5312-STD pistons have?
The BBC5312-STD pistons feature one valve relief with a slant design. This configuration is intended to provide clearance for the valves while maximising combustion chamber efficiency.
What is the piston weight of the BBC5312-STD and how does it affect performance?
The BBC5312-STD pistons weigh 667 grams. While lighter pistons can improve engine response and reduce reciprocating mass, it's crucial to balance them with the rest of the rotating assembly to maintain engine reliability and performance.
Are there any specific machining requirements for the BBC5312-STD pistons?
Yes, the BBC5312-STD pistons may require specific machining for optimal fitment, including ensuring proper bore size and ring land clearance. Always consult your engine builder for precise machining requirements based on your application.
