Big Block Chevy 24.5cc dome 4.560 Bore 4.000 stroke 6.385 rod, 10.9 to 1 with 118cc head (CP Bullets BBC5312-060)
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|
Make |
Chevrolet |
|
Engine Type |
Big Block |
|
Part Number |
BBC5312-060 |
|
Bore (in) |
4.56 |
|
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 |
10.9 |
|
Pin |
.990 x 2.930 |
|
Ring Thickness |
1/16 x 1/16 x 3/16 in. |
|
VR Depth |
-0.31 |
|
Cubic Inch |
523 |
|
Piston Weight |
699 |
|
Style |
Dome |
|
Valve Reliefs |
1 VR with Slant |
|
Gas Port |
No |
| Product Name | Big Block Chevy 24.5cc dome 4.560 Bore 4.000 stroke 6.385 rod, 10.9 to 1 with 118cc head (CP Bullets BBC5312-060) |
|---|---|
| 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 BBC5312-060 pistons?
For the BBC5312-060 pistons, a typical bore clearance of 0.0030" to 0.0035" is advisable. This ensures proper thermal expansion and reduces the risk of piston seizure.
What compression ratio can I expect with the BBC5312-060 pistons and a 118cc head?
The BBC5312-060 pistons provide a compression ratio of 10.9:1 when used with a 118cc head. However, actual compression may vary based on head gasket thickness and combustion chamber modifications.
What type of ring gaps should I set for the BBC5312-060 pistons?
For the BBC5312-060 pistons, ring gaps should typically be set according to the manufacturer's specifications, considering the intended use. A common starting point is 0.004" per inch of bore for the top ring and slightly more for the second ring.
Do I need to machine the piston for valve clearance?
Yes, the BBC5312-060 pistons feature one valve relief with a slant, but additional machining may be required based on your specific camshaft profile and valve lift. Always check for clearance during assembly.
What is the weight of the BBC5312-060 pistons, and how does it affect performance?
The BBC5312-060 pistons weigh 699 grams each. While this weight is typical for performance applications, it's important to consider the overall rotating assembly balance, as heavier pistons can impact engine response and RPM capabilities.
