Small Block Chevy Dome +5cc All 23 Heads 4.155 Bore,3.875 stroke,5.850 rod 13.2 to 1 comp with a 64cc head (CP Bullets BC1230-030)
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|
Make |
Chevrolet |
|
Engine Type |
Small Block |
|
Part Number |
BC1230-030 |
|
Bore (in) |
4.155 |
|
Stroke (in) |
3.875 |
|
Rod Length (in) |
5.85 |
|
Comp Height |
1.219 |
|
Head Type |
All 23 deg |
|
Head CC |
64 |
|
Dome / Dish Height |
0.25 |
|
Dom/Dish CC |
5.1 |
|
Compression Ratio |
13.3 |
|
Pin |
.927 x 2.500 |
|
Ring Thickness |
1.5 x 1.5 x 3.0mm |
|
VR Depth |
-.310 / -.310 |
|
Cubic Inch |
420 |
|
Piston Weight |
426 |
|
Style |
Dome |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Small Block Chevy Dome +5cc All 23 Heads 4.155 Bore,3.875 stroke,5.850 rod 13.2 to 1 comp with a 64cc head (CP Bullets BC1230-030) |
|---|---|
| Brands | CP Carrillo |
| 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 compression ratio for the BC1230-030 pistons?
The BC1230-030 pistons are designed to achieve a compression ratio of approximately 13.2:1 when used with a 64cc cylinder head. Ensure that your engine's specifications and fuel quality can support this level of compression.
What bore and stroke specifications are these pistons designed for?
These pistons are specifically designed for a bore of 4.155 inches and a stroke of 3.875 inches, making them suitable for a Small Block Chevy engine configuration.
What is the weight of the BC1230-030 pistons, and how does it affect performance?
The BC1230-030 pistons weigh 426 grams each. Lighter pistons can improve engine response and reduce stress on the connecting rods, but ensure that your engine's balance is maintained with the full rotating assembly.
Do I need to modify my cylinder heads for valve clearance with these pistons?
Yes, the BC1230-030 pistons feature two valve reliefs, but it's essential to verify that your specific cylinder heads provide adequate clearance for your camshaft profile and valve lift to avoid interference.
What type of ring thickness do these pistons use?
The BC1230-030 pistons are designed to accommodate rings with a thickness of 1.5mm for the top and second rings, and 3.0mm for the oil ring. Proper ring gap settings must be established during installation.
