Chevy 420ci 4.165 Bore 1.062 CH 14.6:1 CR - Lefts & Rights (CP Bullets BCRE1521-040)
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|
Make |
Chevrolet |
|
Engine Type |
Small Block |
|
Part Number |
BCRE1521-040 |
|
Bore (in) |
4.165 |
|
Stroke (in) |
3.875 |
|
Rod Length (in) |
6 |
|
Comp Height |
1.062 |
|
Head Type |
23 * Most Heads |
|
Head CC |
64 |
|
Dome / Dish Height |
0.48 |
|
Dom/Dish CC |
11.2 |
|
Compression Ratio |
14.6 |
|
Pin |
.927 x 2.250 |
|
Ring Thickness |
.043 x .043 x 3.0 |
|
VR Depth |
-.310 / SP |
|
Cubic Inch |
422 |
|
Piston Weight |
505 |
|
Style |
Dome |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
Yes |
| Product Name | Chevy 420ci 4.165 Bore 1.062 CH 14.6:1 CR - Lefts & Rights (CP Bullets BCRE1521-040) |
|---|---|
| Brands | CP Carrillo |
| Engine | Chev |
| 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 bore clearance for the BCRE1521-040 pistons?
For the BCRE1521-040 pistons, a typical bore clearance of 0.0035" to 0.0045" is recommended. However, this can vary based on the specific application and operating conditions, so always consult your engine builder for precise measurements.
What type of fuel is suitable for the 14.6:1 compression ratio of these pistons?
Given the high compression ratio of 14.6:1, these pistons are best suited for high-octane fuels, such as 98 RON or higher, to prevent knocking and ensure optimal performance. Always tune your engine accordingly.
Do I need to modify my cylinder heads to use these pistons?
Depending on your specific cylinder head design, you may need to check for clearance due to the dome height of 0.48". Ensure that your heads can accommodate the piston dome and valve reliefs to avoid any interference.
What is the significance of the gas ports on these pistons?
The gas ports on the BCRE1521-040 pistons help improve ring seal and reduce oil consumption by allowing combustion gases to pressurise the ring pack. This feature is particularly beneficial in high-performance applications where optimal sealing is critical.
What is the weight of the BCRE1521-040 pistons, and how does it affect performance?
The BCRE1521-040 pistons weigh 505 grams each. While this weight is typical for performance applications, it's important to balance the entire rotating assembly to minimise vibration and ensure smooth operation at high RPMs.
