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)
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 4.140 Bore, 3.875 stroke, 6.000 rod 13.8 to 1 comp with a 64cc head - Lefts & Rights (CP Bullets BCR1220-015)
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|
Make |
Chevrolet |
|
Engine Type |
Small Block |
|
Part Number |
BCR1220-015 |
|
Bore (in) |
4.14 |
|
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 |
13.8 |
|
Pin |
.927 x 2.500 |
|
Ring Thickness |
1.2 x 1.2 x 3.0mm |
|
VR Depth |
-.335 / SP |
|
Cubic Inch |
417 |
|
Piston Weight |
445 |
|
Style |
Dome |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | 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) |
|---|---|
| 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 BCR1220-015 pistons?
The BCR1220-015 pistons are designed for a compression ratio of 13.8:1 when used with a 64cc ASCS head. Ensure that your engine's setup, including combustion chamber volume and gasket thickness, aligns with this ratio for optimal performance.
What bore and stroke specifications are compatible with the BCR1220-015 pistons?
These pistons are designed for a 4.140-inch bore and a 3.875-inch stroke. Ensure your engine block is machined to these specifications for proper fitment and performance.
What is the piston weight of the BCR1220-015 and how does it affect engine balance?
The BCR1220-015 pistons weigh 445 grams each. It's important to consider this weight when balancing your rotating assembly, as it can impact engine dynamics and performance at high RPM.
Do the BCR1220-015 pistons require any specific machining before installation?
Yes, the BCR1220-015 pistons may require specific bore clearance and ring gap settings as per your engine build. Always consult with your engine builder to ensure proper fitment and performance.
What type of valve reliefs do the BCR1220-015 pistons have?
The BCR1220-015 pistons feature two valve reliefs, which are designed to accommodate typical valve sizes in Small Block Chevy applications. Ensure your cylinder heads and camshaft specifications are compatible with these reliefs for proper operation.
