Small Block Chevy Dish -21.9cc All 23 Heads 4.155 Bore,3.750 stroke, 6.000 rod 9.5 to 1 comp with a 64cc head (CP Bullets BC1120-030)
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|
Make |
Chevrolet |
|
Engine Type |
Small Block |
|
Part Number |
BC1120-030 |
|
Bore (in) |
4.155 |
|
Stroke (in) |
3.75 |
|
Rod Length (in) |
6 |
|
Comp Height |
1.125 |
|
Head Type |
All 23 deg |
|
Head CC |
64 |
|
Dome / Dish Height |
-0.146 |
|
Dom/Dish CC |
-21.9 |
|
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 |
407 |
|
Piston Weight |
441 |
|
Style |
Dish |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Small Block Chevy Dish -21.9cc All 23 Heads 4.155 Bore,3.750 stroke, 6.000 rod 9.5 to 1 comp with a 64cc head (CP Bullets BC1120-030) |
|---|---|
| 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 when using the BC1120-030 pistons with a 64cc head?
The BC1120-030 pistons are designed to achieve a compression ratio of 9.5:1 when paired with a 64cc head. Ensure that your engine's overall assembly and tuning are optimised to maintain this ratio for best performance.
What machining considerations should I keep in mind when installing the BC1120-030 pistons?
When installing the BC1120-030 pistons, you should ensure the bore clearance is set correctly, typically around 0.0030" to 0.0040" for forged pistons. Also, check that the ring gaps are set according to your specific application, especially if you're running higher RPMs or boost.
What is the weight of the BC1120-030 pistons, and how does it affect engine balance?
The BC1120-030 pistons weigh 441 grams each. This weight should be considered when balancing your rotating assembly, as it can impact engine dynamics and performance. Ensure that the crankshaft, rods, and pistons are all balanced together for optimal operation.
Are there any specific installation tips for the valve reliefs on the BC1120-030 pistons?
The BC1120-030 pistons feature two valve reliefs. When installing, ensure that the reliefs are oriented correctly to match your cylinder head's valve arrangement. This will help prevent any potential interference during operation.
What type of pin is used with the BC1120-030 pistons, and what are its dimensions?
The BC1120-030 pistons use a pin with dimensions of .927 inches in diameter and 2.500 inches in length. Ensure that your connecting rods are compatible with these pin specifications for proper fitment.
