Small Block Chevy USMTS 4.165 Bore, Stroke 4.00", 6.00 rod, 1.000" CH 14:1 CR 1.2mm,1.2mm, 3mm rings - Lefts & Rights (CP Bullets BCR1215-040)
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 4.130 Bore, 3.875 stroke, 6.000 rod 13.75 to 1 comp with a 64cc head - Lefts & Rights (CP Bullets BCR1220-005)
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|
Make |
Chevrolet |
|
Engine Type |
Small Block |
|
Part Number |
BCR1220-005 |
|
Bore (in) |
4.13 |
|
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 |
415 |
|
Piston Weight |
445 |
|
Style |
Dome |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | 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) |
|---|---|
| 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 BCR1220-005 pistons?
The BCR1220-005 pistons are designed for a compression ratio of 13.75:1 when used with a 64cc ASCS head. Ensure that your engine's setup, including fuel quality and tuning, can support this high compression.
What bore and stroke specifications are these pistons designed for?
These pistons are designed for a bore of 4.130 inches and a stroke of 3.875 inches, making them suitable for a 415 cubic inch Small Block Chevy or Holden engine.
Do I need to modify the engine for these pistons?
You may need to verify and potentially adjust the bore clearance and ring gaps during installation. Additionally, ensure that the valve reliefs are compatible with your camshaft profile to avoid interference.
What is the weight of the BCR1220-005 pistons, and how does it affect performance?
The BCR1220-005 pistons weigh 445 grams. Lighter pistons can improve engine response and reduce reciprocating mass, but ensure that your engine's rotating assembly is balanced accordingly.
Are these pistons suitable for high-performance applications?
Yes, the BCR1220-005 pistons are designed for high-performance applications, particularly in racing environments. However, reliability will depend on proper machining, clearances, and tuning specific to your engine setup.
