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)
Small Block Chevy USMTS dome +8cc ASCS Head 4.165 Bore, 3.875 stroke, 6.000 rod 14.1 to 1 comp with a 64cc head - Lefts & Rights (CP Bullets BCR1220-040)
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)
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|
Make |
Chevrolet |
|
Engine Type |
Small Block |
|
Part Number |
BCR1220-030 |
|
Bore (in) |
4.155 |
|
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 |
420 |
|
Piston Weight |
445 |
|
Style |
Dome |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | 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) |
|---|---|
| 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 BCR1220-030 pistons?
The BCR1220-030 pistons are designed for a compression ratio of 13.9:1 when used with a 64cc ASCS head. Ensure your engine is properly tuned to handle this high compression for optimal performance.
What bore and stroke specifications are compatible with the BCR1220-030 pistons?
These pistons are designed for a bore of 4.155 inches and a stroke of 3.875 inches, making them suitable for a 420 cubic inch Small Block Chevy engine configuration.
What is the weight of the BCR1220-030 pistons, and how does it affect engine balance?
The BCR1220-030 pistons weigh 445 grams each. It's crucial to balance the entire rotating assembly, including these pistons, to minimise vibrations and ensure engine longevity at high RPMs.
What type of valve reliefs do the BCR1220-030 pistons have?
The BCR1220-030 pistons feature two valve reliefs, which are essential for clearance with the valves when the engine is running. Ensure that your cylinder heads and camshaft are compatible to avoid interference.
What is the recommended installation procedure for the BCR1220-030 pistons?
When installing the BCR1220-030 pistons, ensure that the piston-to-wall clearance and ring gaps are set according to your specific engine build. Proper machining and attention to detail during installation will enhance performance and reliability.
