Small Block Chevy USMTS dome +8cc ASCS Head 4.130 Bore, 3.875 stroke, 6.000 rod 13.75 to 1 comp with a 64cc head - Lefts & Rights (CP Bullets BCR1220-005)
Small Block Chevy USMTS dome +8cc ASCS Head 4.140 Bore, 3.875 stroke, 6.000 rod 13.8 to 1 comp with a 64cc head - Lefts & Rights (CP Bullets BCR1220-015)
Small Block Chevy USMTS dome +8cc ASCS Head 4.135 Bore, 3.875 stroke, 6.000 rod 13.75 to 1 comp with a 64cc head - Lefts & Rights (CP Bullets BCR1220-010)
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|
Make |
Chevrolet |
|
Engine Type |
Small Block |
|
Part Number |
BCR1220-010 |
|
Bore (in) |
4.135 |
|
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 |
13.75 |
|
Pin |
.927 x 2.500 |
|
Ring Thickness |
1.2 x 1.2 x 3.0mm |
|
VR Depth |
-.335 / SP |
|
Cubic Inch |
416 |
|
Piston Weight |
445 |
|
Style |
Dome |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Small Block Chevy USMTS dome +8cc ASCS Head 4.135 Bore, 3.875 stroke, 6.000 rod 13.75 to 1 comp with a 64cc head - Lefts & Rights (CP Bullets BCR1220-010) |
|---|---|
| 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 bore clearance for the BCR1220-010 pistons?
For the BCR1220-010 pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. This ensures proper thermal expansion and prevents piston slap during operation. Always verify with your specific engine build requirements.
What compression ratio can I expect with the BCR1220-010 pistons and a 64cc head?
The BCR1220-010 pistons are designed to achieve a compression ratio of 13.75:1 when used with a 64cc head. However, actual compression may vary based on factors like head gasket thickness and combustion chamber modifications.
What are the valve relief specifications for the BCR1220-010 pistons?
The BCR1220-010 pistons feature two valve reliefs, which are designed to accommodate typical valve sizes in Small Block Chevy applications. Ensure your camshaft and valve train setup are compatible to avoid interference.
What is the recommended installation height for the BCR1220-010 pistons?
The recommended installation height for the BCR1220-010 pistons is critical for achieving the desired compression ratio. The piston has a compression height of 1.062 inches, so ensure your deck height is measured accurately for optimal performance.
What is the weight of the BCR1220-010 pistons, and how does it affect engine balance?
The BCR1220-010 pistons weigh 445 grams each. This weight should be considered when balancing the rotating assembly, as it can affect engine dynamics and performance. Ensure all components are matched for optimal balance.
