Small Block Chevy Flat Top -6.83cc All 23 Heads 4.040 Bore,3.750 stroke, 6.000 rod 10.5 to 1 comp with a 64cc head (CP Bullets BC1025-040)
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|
Make |
Chevrolet |
|
Engine Type |
Small Block |
|
Part Number |
BC1025-040 |
|
Bore (in) |
4.04 |
|
Stroke (in) |
3.75 |
|
Rod Length (in) |
6 |
|
Comp Height |
1.125 |
|
Head Type |
All 23 deg |
|
Head CC |
64 |
|
Dome / Dish Height |
FT |
|
Dom/Dish CC |
-6.8 |
|
Compression Ratio |
10.6 |
|
Pin |
.927 x 2.500 |
|
Ring Thickness |
1.5 x 1.5 x 3.0mm |
|
VR Depth |
-.310 / -.310 |
|
Cubic Inch |
385 |
|
Piston Weight |
397 |
|
Style |
FT |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Small Block Chevy Flat Top -6.83cc All 23 Heads 4.040 Bore,3.750 stroke, 6.000 rod 10.5 to 1 comp with a 64cc head (CP Bullets BC1025-040) |
|---|---|
| Brands | CP Carrillo |
| 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 BC1025-040 pistons?
For the BC1025-040 pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. However, final clearance should be determined by the engine builder based on specific application and tolerances.
What compression ratio can I expect with the BC1025-040 pistons and a 64cc head?
The BC1025-040 pistons are designed to achieve a compression ratio of approximately 10.6:1 when used with a 64cc cylinder head. Keep in mind that actual compression may vary based on factors like head gasket thickness and combustion chamber volume.
What type of ring gaps should I set for the BC1025-040 pistons?
For the BC1025-040 pistons, it's crucial to set the ring gaps according to the manufacturer's specifications and the intended use of the engine. A common starting point is 0.004" per inch of bore for the top rings and slightly more for the second rings, but always verify with your specific application.
Do I need to machine the piston for valve reliefs?
The BC1025-040 pistons come with two valve reliefs designed for compatibility with most 23-degree cylinder heads. However, it's essential to check valve-to-piston clearance during assembly, especially if using aftermarket camshafts or different head configurations.
What is the weight of the BC1025-040 pistons and how does it affect performance?
The BC1025-040 pistons weigh 397 grams each. While lighter pistons can improve engine response and reduce reciprocating mass, it's important to balance them with the rest of the rotating assembly for optimal performance and reliability.
