Chevy 405ci ASCS 4.145 Bore 1.125 CH 8cc Dome Vert Gas Ports - Lefts & Rights (CP Bullets BCRE1221-020)
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|
Make |
Chevrolet |
|
Engine Type |
Small Block |
|
Part Number |
BCRE1221-020 |
|
Bore (in) |
4.145 |
|
Stroke (in) |
3.75 |
|
Rod Length (in) |
6 |
|
Comp Height |
1.125 |
|
Head Type |
ASCS |
|
Head CC |
64 |
|
Dome / Dish Height |
0.275 |
|
Dom/Dish CC |
8 |
|
Compression Ratio |
13.6 |
|
Pin |
.927 x 2.250 |
|
Ring Thickness |
1.0 x 1.0 x 2.0mm |
|
VR Depth |
-.335 / SP |
|
Cubic Inch |
405 |
|
Piston Weight |
459 |
|
Style |
Dome |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Chevy 405ci ASCS 4.145 Bore 1.125 CH 8cc Dome Vert Gas Ports - Lefts & Rights (CP Bullets BCRE1221-020) |
|---|---|
| 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 BCRE1221-020 pistons?
For the BCRE1221-020 pistons, a typical bore clearance of 0.0030" to 0.0040" is recommended. This can vary based on your specific engine application and operating conditions, so always consult your engine builder for precise measurements.
What compression ratio can I expect with the BCRE1221-020 pistons in my 405ci Chevy engine?
The BCRE1221-020 pistons provide a compression ratio of approximately 13.6:1 when used with a 64cc head. However, actual compression may vary based on factors such as head gasket thickness and chamber modifications.
What type of ring set should I use with the BCRE1221-020 pistons?
The BCRE1221-020 pistons are designed for use with a 1.0 x 1.0 x 2.0mm ring set. Ensure that the rings are properly gapped according to your engine's specifications for optimal performance.
Do I need to machine the piston pin bores for the BCRE1221-020 pistons?
The piston pin bores on the BCRE1221-020 pistons may require honing to achieve the correct fit with your connecting rods. Always check the fitment and clearances during assembly to ensure proper operation.
What is the weight of the BCRE1221-020 pistons, and how does it affect performance?
The BCRE1221-020 pistons weigh 459 grams each. While lighter pistons can improve engine response and reduce reciprocating mass, it's essential to balance them with the rest of the rotating assembly for optimal performance and reliability.
