Small Block Chevy Dome +5cc All 23 Heads 4.165 Bore,3.875 stroke, 6.000 rod 13.3 to 1 comp with a 64cc head (CP Bullets BC1220-040)
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|
Make |
Chevrolet |
|
Engine Type |
Small Block |
|
Part Number |
BC1220-040 |
|
Bore (in) |
4.165 |
|
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 |
13.3 |
|
Pin |
.927 x 2.500 |
|
Ring Thickness |
1.5 x 1.5 x 3.0mm |
|
VR Depth |
-.310 / -.310 |
|
Cubic Inch |
422 |
|
Piston Weight |
438 |
|
Style |
Dome |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Small Block Chevy Dome +5cc All 23 Heads 4.165 Bore,3.875 stroke, 6.000 rod 13.3 to 1 comp with a 64cc head (CP Bullets BC1220-040) |
|---|---|
| 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 bore clearance for the BC1220-040 pistons?
For the BC1220-040 pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. This ensures proper thermal expansion and reduces the risk of piston scuffing.
What compression ratio can I expect with these pistons and a 64cc head?
These pistons are designed to achieve a compression ratio of 13.3:1 when used with a 64cc cylinder head. However, actual compression may vary based on the specific engine assembly and machining tolerances.
Do I need to modify my cylinder heads for valve clearance with these pistons?
Yes, you may need to check for valve clearance due to the dome design of the BC1220-040 pistons. The two valve reliefs help, but it's crucial to verify clearance during assembly to prevent interference.
What is the weight of the BC1220-040 pistons, and how does it affect my engine?
The BC1220-040 pistons weigh 438 grams each. This weight can affect engine balance and performance, so it's advisable to consider the total rotating assembly weight when building your engine.
What type of rings are compatible with the BC1220-040 pistons?
The BC1220-040 pistons are designed to work with standard 1.5mm x 1.5mm x 3.0mm ring sets. Ensure that the rings are properly gapped according to your specific application for optimal performance.
