Chevy 385ci All 23° 4.040 Bore 1.425 CH -16.2cc Dish (CP Bullets BC1030-040)
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|
Make |
Chevrolet |
|
Engine Type |
Small Block |
|
Part Number |
BC1030-040 |
|
Bore (in) |
4.04 |
|
Stroke (in) |
3.75 |
|
Rod Length (in) |
5.7 |
|
Comp Height |
1.425 |
|
Head Type |
All 23 deg |
|
Head CC |
64 |
|
Dome / Dish Height |
-0.103 |
|
Dom/Dish CC |
-16.2 |
|
Compression Ratio |
9.5 |
|
Pin |
.927 x 2.500 |
|
Ring Thickness |
1.5 x 1.5 x 3.0mm |
|
VR Depth |
-.310 / -.310 |
|
Cubic Inch |
385 |
|
Piston Weight |
452 |
|
Style |
Dish |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Chevy 385ci All 23° 4.040 Bore 1.425 CH -16.2cc Dish (CP Bullets BC1030-040) |
|---|---|
| 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 BC1030-040 pistons?
For the BC1030-040 pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. However, final clearance should be determined based on the specific engine build and intended use.
What compression ratio can I expect with these pistons in my 385ci small block?
The BC1030-040 pistons provide a compression ratio of approximately 9.5:1 when used with 64cc heads. Ensure that your specific engine configuration and combustion chamber volume are considered for accurate calculations.
What type of ring set is compatible with the BC1030-040 pistons?
The BC1030-040 pistons use a ring thickness of 1.5mm x 1.5mm x 3.0mm. It's important to select a ring set that matches these dimensions for optimal performance.
Do I need to modify the piston for valve clearance with my 23° heads?
The BC1030-040 pistons come with two valve reliefs, which should provide adequate clearance for most 23° head configurations. However, it's advisable to check clearance during assembly to ensure proper fitment.
What is the weight of the BC1030-040 pistons, and how does it affect my engine build?
The BC1030-040 pistons weigh 452 grams. This weight can influence engine balance and performance, so consider it when selecting other rotating assembly components to maintain optimal dynamics.
