Small Block Chevy Dome +5cc All 23 Heads 4.125 Bore,3.750 stroke, 5.700 rod 12.6 to 1 comp with a 64cc head (CP Bullets BC1250-STD)
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|
Make |
Chevrolet |
|
Engine Type |
Small Block |
|
Part Number |
BC1250-STD |
|
Bore (in) |
4.125 |
|
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 |
|
Compression Ratio |
12.6 |
|
Pin |
.927 x 2.500 |
|
Ring Thickness |
1.5 x 1.5 x 3.0mm |
|
VR Depth |
-.310 / -.310 |
|
Cubic Inch |
401 |
|
Piston Weight |
476 |
|
Style |
Dome |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Small Block Chevy Dome +5cc All 23 Heads 4.125 Bore,3.750 stroke, 5.700 rod 12.6 to 1 comp with a 64cc head (CP Bullets BC1250-STD) |
|---|---|
| Brands | CP Carrillo |
| Engine | SB Chevrolet / Holden |
| 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 BC1250-STD pistons?
For the BC1250-STD pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. However, always verify with your specific engine setup and consider factors like material expansion and operating conditions.
What compression ratio can I expect with the BC1250-STD pistons and a 64cc head?
The BC1250-STD pistons are designed to achieve a compression ratio of 12.6:1 when used with a 64cc cylinder head. Ensure that your engine is properly tuned and that fuel quality is suitable for high compression applications.
What type of ring set should I use with the BC1250-STD pistons?
The BC1250-STD pistons come with a ring thickness of 1.5 x 1.5 x 3.0mm. It's advisable to use a compatible ring set designed for performance applications to ensure optimal sealing and durability.
Do I need to machine the piston for valve clearance with the BC1250-STD?
The BC1250-STD pistons feature two valve reliefs, but depending on your specific camshaft profile and head design, additional machining may be necessary to ensure adequate valve clearance. Always check your clearances during assembly.
What is the weight of the BC1250-STD pistons and how does it affect engine performance?
The BC1250-STD pistons weigh 476 grams each. While lighter pistons can improve engine response and reduce reciprocating mass, ensure that your connecting rods and crankshaft are compatible with this weight for optimal performance and reliability.
