Big Block Chevy Tall Deck 24.9cc dome 4.530 Bore 4.500 stroke 6.700 rod, 12.3 to 1 with 118cc head (CP Bullets BBC5305-030)
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|
Make |
Chevrolet |
|
Engine Type |
Big Block |
|
Part Number |
BBC5305-030 |
|
Bore (in) |
4.53 |
|
Stroke (in) |
4.5 |
|
Rod Length (in) |
6.7 |
|
Comp Height |
1.245 |
|
Head Type |
24 OC |
|
Head CC |
118 |
|
Dome / Dish Height |
0.25 |
|
Dom/Dish CC |
24.9 |
|
Compression Ratio |
12.3 |
|
Pin |
.990 x 2.930 |
|
Ring Thickness |
1/16 x 1/16 x 3/16 in. |
|
VR Depth |
-0.31 |
|
Cubic Inch |
580 |
|
Piston Weight |
642 |
|
Style |
Dome |
|
Valve Reliefs |
1 VR with Slant |
|
Gas Port |
No |
| Product Name | Big Block Chevy Tall Deck 24.9cc dome 4.530 Bore 4.500 stroke 6.700 rod, 12.3 to 1 with 118cc head (CP Bullets BBC5305-030) |
|---|---|
| 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 BBC5305-030 pistons?
For the BBC5305-030 pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. However, this can vary based on your specific engine build and intended use, so always consult with your engine builder for the best fit.
What are the ideal ring gap specifications for these pistons?
While specific ring gap settings can depend on your application, a common starting point for these pistons is 0.004" per inch of bore for the top ring and slightly more for the second ring. Adjustments may be necessary based on boost levels and RPM.
Can I use the BBC5305-030 pistons with a different rod length?
The BBC5305-030 pistons are designed for a 6.700" rod length. Using them with a different rod length may affect your compression ratio and piston-to-valve clearance, so it's crucial to ensure compatibility with your specific setup.
What type of fuel is recommended for the 12.3:1 compression ratio of these pistons?
For a 12.3:1 compression ratio, premium pump fuel or race fuel with an octane rating of at least 98 RON is recommended to prevent detonation. Always tune your engine accordingly to match your fuel choice.
What machining processes are necessary before installing these pistons?
Before installing the BBC5305-030 pistons, ensure the cylinder bores are properly honed to match the piston dimensions and that ring gaps are set correctly. Additionally, verify that the crankshaft and connecting rods are balanced with the full rotating assembly for optimal performance.
