Small Block Chevy Dish -20.5cc All 23 Heads 4.125 Bore,3.750 stroke, 5.700 rod 9.5 to 1 comp with a 64cc head (CP Bullets BC1121-STD)
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|
Make |
Chevrolet |
|
Engine Type |
Small Block |
|
Part Number |
BC1121-STD |
|
Bore (in) |
4.125 |
|
Stroke (in) |
3.75 |
|
Rod Length (in) |
5.7 |
|
Comp Height |
1.425 |
|
Head Type |
All 23 deg |
|
Head CC |
64 |
|
Dome / Dish Height |
-0.138 |
|
Dom/Dish CC |
-20.5 |
|
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 |
401 |
|
Piston Weight |
492 |
|
Style |
Dish |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Small Block Chevy Dish -20.5cc All 23 Heads 4.125 Bore,3.750 stroke, 5.700 rod 9.5 to 1 comp with a 64cc head (CP Bullets BC1121-STD) |
|---|---|
| Brands | CP Carrillo |
| Engine | SB Chevrolet / Holden |
| 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 BC1121-STD pistons?
The BC1121-STD pistons are designed for a compression ratio of 9.5:1 when used with a 64cc cylinder head. Ensure that the overall combination of components is compatible to achieve this ratio.
What bore and stroke specifications are these pistons designed for?
These pistons are designed for a 4.125-inch bore and a 3.750-inch stroke, making them suitable for Small Block Chevy applications with a 5.700-inch rod length.
What type of valve reliefs do the BC1121-STD pistons have?
The BC1121-STD pistons feature two valve reliefs, which are essential for clearance with the valves in high-performance applications. Ensure your cylinder heads are compatible with this design.
What is the weight of the BC1121-STD pistons?
The BC1121-STD pistons weigh 492 grams each. This weight should be considered when balancing the rotating assembly for optimal performance.
What is the dish volume of the BC1121-STD pistons?
The BC1121-STD pistons have a dish volume of -20.5cc. This contributes to the overall compression ratio and should be factored into your engine's design and tuning.
