Small Block Chevy USMTS dome +8cc ASCS Head 4.145 Bore, 3.875 stroke, 6.000 rod 13.8 to 1 comp with a 64cc head - Lefts & Rights (CP Bullets BCR1220-020)
Small Block Chevy USMTS dome +8cc ASCS Head 4.155 Bore, 3.875 stroke, 6.000 rod 13.9 to 1 comp with a 64cc head - Lefts & Rights (CP Bullets BCR1220-030)
Small Block Chevy USMTS dome +8cc ASCS Head 4.150 Bore, 3.875 stroke, 6.000 rod 13.9 to 1 comp with a 64cc head - Lefts & Rights (CP Bullets BCR1220-025)
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|
Make |
Chevrolet |
|
Engine Type |
Small Block |
|
Part Number |
BCR1220-025 |
|
Bore (in) |
4.15 |
|
Stroke (in) |
3.875 |
|
Rod Length (in) |
6 |
|
Comp Height |
1.062 |
|
Head Type |
ASCS |
|
Head CC |
64 |
|
Dome / Dish Height |
0.275 |
|
Dom/Dish CC |
8 |
|
Compression Ratio |
13.9 |
|
Pin |
.927 x 2.500 |
|
Ring Thickness |
1.2 x 1.2 x 3.0mm |
|
VR Depth |
-.335 / SP |
|
Cubic Inch |
419 |
|
Piston Weight |
445 |
|
Style |
Dome |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Small Block Chevy USMTS dome +8cc ASCS Head 4.150 Bore, 3.875 stroke, 6.000 rod 13.9 to 1 comp with a 64cc head - Lefts & Rights (CP Bullets BCR1220-025) |
|---|---|
| Brands | CP Carrillo |
| Engine | SB Chevrolet / Holden |
| 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 is the recommended compression ratio for the BCR1220-025 pistons?
The BCR1220-025 pistons are designed for a compression ratio of 13.9:1 when used with a 64cc ASCS head. Ensure that your engine's setup, including fuel quality and tuning, can accommodate this high compression.
What bore and stroke specifications are compatible with the BCR1220-025 pistons?
These pistons are compatible with a 4.150-inch bore and a 3.875-inch stroke. It's crucial to verify that your engine block is machined to these specifications for optimal performance.
What is the significance of the dome height on the BCR1220-025 pistons?
The dome height of 0.275 inches on the BCR1220-025 pistons contributes to the overall compression ratio and combustion characteristics. Proper clearance must be maintained to avoid piston-to-valve contact, especially with high-lift camshafts.
What type of ring thickness is provided with the BCR1220-025 pistons?
The BCR1220-025 pistons come with a ring thickness of 1.2mm x 1.2mm x 3.0mm. Ensure that your cylinder bore is prepared to accommodate these rings for optimal sealing and performance.
Are these pistons suitable for high-performance applications?
Yes, the BCR1220-025 pistons are designed for high-performance applications, particularly in racing scenarios. However, reliability will depend on proper machining, clearances, and tuning specific to your engine setup.
