Small Block Chevy Flat Top -6.83cc All 23 Heads 4.040 Bore,3.750 stroke, 5.700 rod 10.5 to 1 comp with a 64cc head (CP Bullets BC1026-040)
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|
Make |
Chevrolet |
|
Engine Type |
Small Block |
|
Part Number |
BC1026-040 |
|
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 |
FT |
|
Dom/Dish CC |
-6.8 |
|
Compression Ratio |
10.7 |
|
Pin |
.927 x 2.500 |
|
Ring Thickness |
1.5 x 1.5 x 3.0mm |
|
VR Depth |
-.310 / -.310 |
|
Cubic Inch |
385 |
|
Piston Weight |
436 |
|
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, 5.700 rod 10.5 to 1 comp with a 64cc head (CP Bullets BC1026-040) |
|---|---|
| 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 BC1026-040 pistons?
For the BC1026-040 pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. However, always verify with your specific engine build and ensure proper fitting during assembly.
What compression ratio can I expect with the BC1026-040 pistons and a 64cc head?
With the BC1026-040 pistons and a 64cc head, the compression ratio is approximately 10.5:1. Keep in mind that actual compression may vary based on factors like deck height and gasket thickness.
What type of ring gaps should I use with the BC1026-040 pistons?
For the BC1026-040 pistons, ring gaps should be set according to the manufacturer's specifications, typically around 0.004" to 0.005" per inch of bore for the top rings and slightly larger for the second rings. Adjust based on your intended use and boost levels.
Do I need to modify my cylinder heads for the BC1026-040 pistons?
The BC1026-040 pistons feature two valve reliefs, which should accommodate most 23-degree cylinder heads. However, it's essential to check for clearance with your specific setup, especially at higher lift cam profiles.
What is the weight of the BC1026-040 pistons, and how does it affect performance?
The BC1026-040 pistons weigh 436 grams each. While lighter pistons can improve throttle response and reduce reciprocating mass, ensure that your engine's rotating assembly is balanced to maintain reliability and performance.
