Small Block Chevy Dome +5cc All 23 Heads 4.155 Bore,3.750 stroke, 5.700 rod 12.8 to 1 comp with a 64cc head (CP Bullets BC1250-030)
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|
Make |
Chevrolet |
|
Engine Type |
Small Block |
|
Part Number |
BC1250-030 |
|
Bore (in) |
4.155 |
|
Stroke (in) |
3.75 |
|
Rod Length (in) |
5.7 |
|
Comp Height |
1.425 |
|
Head Type |
All 23 deg |
|
Head CC |
64 |
|
Dome / Dish Height |
0.235 |
|
Dom/Dish CC |
5.1 |
|
Compression Ratio |
12.8 |
|
Pin |
.927 x 2.500 |
|
Ring Thickness |
1.5 x 1.5 x 3.0mm |
|
VR Depth |
-.310 / -.310 |
|
Cubic Inch |
407 |
|
Piston Weight |
488 |
|
Style |
Dome |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Small Block Chevy Dome +5cc All 23 Heads 4.155 Bore,3.750 stroke, 5.700 rod 12.8 to 1 comp with a 64cc head (CP Bullets BC1250-030) |
|---|---|
| Brands | CP Carrillo |
| Make | GM |
Delivery & Freight
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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 compression ratio can I expect with the BC1250-030 pistons?
The BC1250-030 pistons are designed to achieve a compression ratio of 12.8:1 when used with a 64cc cylinder head. However, actual compression may vary based on the specific engine setup and machining tolerances.
What is the recommended bore clearance for these pistons?
For the BC1250-030 pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. Always verify with your engine builder as clearances can vary based on specific applications and tolerances.
Do I need to modify my cylinder heads for valve clearance with these pistons?
Yes, the BC1250-030 pistons feature two valve reliefs, but you should always check for adequate valve clearance during engine assembly, especially if using high-lift camshafts or modified cylinder heads.
What is the weight of the BC1250-030 pistons and how does it affect performance?
The BC1250-030 pistons weigh 488 grams each. Lighter pistons can improve engine response and reduce stress on the connecting rods, but ensure your engine is balanced with the full rotating assembly for optimal performance.
What type of rings should I use with the BC1250-030 pistons?
The BC1250-030 pistons are designed for use with 1.5mm, 1.5mm, and 3.0mm ring thicknesses. Select high-quality rings that match these dimensions to ensure proper sealing and performance.
