Small Block Chevy Flat Top -6.83cc All 23 Heads 4.020 Bore,3.500 stroke, 6.000 rod 9.8 to 1 comp with a 64cc head (CP Bullets BC1020-020)
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|
Make |
Chevrolet |
|
Engine Type |
Small Block |
|
Part Number |
BC1020-020 |
|
Bore (in) |
4.02 |
|
Stroke (in) |
3.5 |
|
Rod Length (in) |
6 |
|
Comp Height |
1.25 |
|
Head Type |
All 23 deg |
|
Head CC |
64 |
|
Dome / Dish Height |
FT |
|
Dom/Dish CC |
-6.8 |
|
Compression Ratio |
9.8 |
|
Pin |
.927 x 2.500 |
|
Ring Thickness |
1.5 x 1.5 x 3.0mm |
|
VR Depth |
-.310 / -.310 |
|
Cubic Inch |
355 |
|
Piston Weight |
404 |
|
Style |
FT |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Small Block Chevy Flat Top -6.83cc All 23 Heads 4.020 Bore,3.500 stroke, 6.000 rod 9.8 to 1 comp with a 64cc head (CP Bullets BC1020-020) |
|---|---|
| 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 compression ratio for the BC1020-020 pistons with a 64cc head?
The BC1020-020 pistons are designed to achieve a compression ratio of 9.8:1 when paired with a 64cc cylinder head. Ensure that your engine's actual compression ratio is verified through proper measurements, as factors like head gasket thickness and machining can affect the final ratio.
What are the specific machining requirements for the BC1020-020 pistons?
When installing the BC1020-020 pistons, it's crucial to ensure the bore clearance is set correctly, typically around 0.0030" to 0.0040" for a performance application. Additionally, ring gaps should be tailored to your engine's intended use, especially if you're running higher RPMs or boost.
What type of rod length is compatible with the BC1020-020 pistons?
The BC1020-020 pistons are designed to work with a 6.000" connecting rod. Ensure that your connecting rods are compatible and that the big-end and small-end clearances are appropriately checked and honed if necessary.
Are there any specific considerations for valve reliefs with the BC1020-020 pistons?
The BC1020-020 pistons feature two valve reliefs, which are designed to accommodate typical valve sizes in 23-degree heads. However, it's essential to verify that your specific camshaft and valve train setup do not interfere with the piston during operation.
What is the weight of the BC1020-020 pistons and how does it affect performance?
The BC1020-020 pistons weigh 404 grams each. While this weight is suitable for performance applications, consider the overall rotating assembly weight and balance, as it can impact engine responsiveness and RPM capabilities. Proper balancing of the crankshaft with the full rotating assembly is recommended.
