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 Chrysler EQ Magnum 4.020 bore, 3.580 stroke, 6.123 rod , 1.645 CH Inv Dish -18cc 9.0 to 1 Com 1.2mm, 1.2mm, 3mm rings (CP Bullets BMR4200-020)
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)
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|
Make |
Chevrolet |
|
Engine Type |
Small Block |
|
Part Number |
BCR1220-040 |
|
Bore (in) |
4.165 |
|
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 |
14 |
|
Pin |
.927 x 2.500 |
|
Ring Thickness |
1.2 x 1.2 x 3.0mm |
|
VR Depth |
-.335 / SP |
|
Cubic Inch |
422 |
|
Piston Weight |
445 |
|
Style |
Dome |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | 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) |
|---|---|
| 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 BCR1220-040 pistons?
For the BCR1220-040 pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. This ensures proper thermal expansion and prevents piston scuffing during operation.
What compression ratio can I expect with the BCR1220-040 pistons?
The BCR1220-040 pistons are designed to achieve a compression ratio of 14.1:1 when used with a 64cc head. However, actual compression can vary based on factors like head gasket thickness and combustion chamber modifications.
What type of fuel is suitable for an engine using BCR1220-040 pistons?
Engines with BCR1220-040 pistons, operating at a high compression ratio of 14.1:1, typically require high-octane fuel, such as 98 RON or higher, to prevent detonation and ensure optimal performance.
Are there specific machining requirements for the BCR1220-040 pistons?
Yes, the BCR1220-040 pistons may require specific machining for proper fitment, including honing of the cylinder bores to achieve the recommended clearance and ensuring the ring lands are correctly sized for the rings used.
What is the weight of the BCR1220-040 pistons, and how does it affect engine performance?
The BCR1220-040 pistons weigh 445 grams each. Lighter pistons can improve engine response and reduce stress on the connecting rods, but it's essential to balance them with the entire rotating assembly for optimal performance.
