Small Block Chevy Dome +5cc All 23 Heads 4.125 Bore,3.875 stroke, 6.000 rod 13.1 to 1 comp with a 64cc head (CP Bullets BC1220-STD)
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|
Make |
Chevrolet |
|
Engine Type |
Small Block |
|
Part Number |
BC1220-STD |
|
Bore (in) |
4.125 |
|
Stroke (in) |
3.875 |
|
Rod Length (in) |
6 |
|
Comp Height |
1.062 |
|
Head Type |
All 23 deg |
|
Head CC |
64 |
|
Dome / Dish Height |
0.235 |
|
Dom/Dish CC |
5.1 |
|
Compression Ratio |
13 |
|
Pin |
.927 x 2.500 |
|
Ring Thickness |
1.5 x 1.5 x 3.0mm |
|
VR Depth |
-.310 / -.310 |
|
Cubic Inch |
414 |
|
Piston Weight |
426 |
|
Style |
Dome |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Small Block Chevy Dome +5cc All 23 Heads 4.125 Bore,3.875 stroke, 6.000 rod 13.1 to 1 comp with a 64cc head (CP Bullets BC1220-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 compression ratio for the BC1220-STD pistons?
The BC1220-STD pistons are designed to achieve a compression ratio of 13.1:1 when used with a 64cc cylinder head. Ensure that your engine's overall setup, including head gasket thickness and combustion chamber volume, is accounted for to achieve this ratio.
What are the specific machining requirements for these pistons?
When installing the BC1220-STD pistons, ensure that the bore clearance is set correctly according to your engine's specifications. Additionally, check that the ring gaps are properly set, as this is crucial for performance and reliability. Always consult with your engine builder for precise machining tolerances.
What is the pin size and length for the BC1220-STD pistons?
The BC1220-STD pistons feature a pin size of .927 inches and a length of 2.500 inches. Ensure that your conrods are compatible with these specifications for proper fitment.
Are there any specific considerations for valve reliefs with these pistons?
The BC1220-STD pistons come with two valve reliefs. When using these pistons, confirm that your camshaft and valve train setup provide adequate clearance to prevent interference during operation, especially at higher RPMs.
What is the weight of the BC1220-STD pistons, and how does it affect performance?
The BC1220-STD pistons weigh 426 grams each. While lighter pistons can improve engine response and RPM capabilities, ensure that the overall rotating assembly is balanced to maintain engine reliability and performance.
