Small Block Chevy USMTS 4.155 Bore, Stroke 3.875, 6.00 rod, 1.062 CH Vert Gas Ports 14:1 CR 1mm,1mm, 2mm rings - Lefts & Rights (CP Bullets BCRE1220-030)
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 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)
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|
Make |
Chevrolet |
|
Engine Type |
Small Block |
|
Part Number |
BCR1215-040 |
|
Bore (in) |
4.165 |
|
Stroke (in) |
4 |
|
Rod Length (in) |
6 |
|
Comp Height |
1 |
|
Head Type |
ASCS |
|
Head CC |
64 |
|
Dome / Dish Height |
0.275 |
|
Dom/Dish CC |
8 |
|
Compression Ratio |
14.5 |
|
Pin |
.927 x 2.500 |
|
Ring Thickness |
1.2 x 1.2 x 3.0mm |
|
VR Depth |
-.335 / SP |
|
Cubic Inch |
436 |
|
Piston Weight |
450 |
|
Style |
Dome |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | 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) |
|---|---|
| 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 BCR1215-040 pistons?
For the BCR1215-040 pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. However, this may vary based on your specific engine build and operating conditions, so always consult with your engine builder for precise measurements.
What type of fuel is suitable for the 14.5:1 compression ratio of these pistons?
With a compression ratio of 14.5:1, these pistons are best suited for high-octane fuel, such as 98 RON or higher. Ensure your fuel quality is consistent to prevent detonation, especially under high load conditions.
What is the significance of the dome height on the BCR1215-040 pistons?
The dome height of 0.275" on the BCR1215-040 pistons contributes to the overall compression ratio and combustion characteristics. It is crucial to ensure that the piston dome design matches your cylinder head configuration to optimise performance and prevent interference.
Do I need to machine the piston pin bores for the BCR1215-040 pistons?
The piston pin bores on the BCR1215-040 pistons are typically designed for a .927" pin. However, it is advisable to check the fitment with your connecting rods, as some machining may be required depending on the specific rod design and tolerances.
What is the weight of the BCR1215-040 pistons and how does it affect engine performance?
The BCR1215-040 pistons weigh 450 grams each. Lighter pistons can improve engine response and reduce stress on the rotating assembly, but ensure that your engine is balanced accordingly to maintain reliability at higher RPMs.
