Big Block Chevy -3.4cc Flat Top 4.500 Bore 4.500 stroke 6.700 rod, 9.5 to 1 with 118cc head (CP Bullets BBC5205-STD)
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|
Make |
Chevrolet |
|
Engine Type |
Big Block |
|
Part Number |
BBC5205-STD |
|
Bore (in) |
4.5 |
|
Stroke (in) |
4.5 |
|
Rod Length (in) |
6.7 |
|
Comp Height |
1.245 |
|
Head Type |
24 OC |
|
Head CC |
118 |
|
Dome / Dish Height |
FT |
|
Dom/Dish CC |
-3.4 |
|
Compression Ratio |
9.7 |
|
Pin |
.990 x 2.930 |
|
Ring Thickness |
1/16 x 1/16 x 3/16 in. |
|
VR Depth |
-0.31 |
|
Cubic Inch |
573 |
|
Piston Weight |
642 |
|
Style |
FT |
|
Valve Reliefs |
1 VR with Slant |
|
Gas Port |
No |
| Product Name | Big Block Chevy -3.4cc Flat Top 4.500 Bore 4.500 stroke 6.700 rod, 9.5 to 1 with 118cc head (CP Bullets BBC5205-STD) |
|---|---|
| Brands | CP Carrillo |
| Engine | Big Block Chev |
| 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 BBC5205-STD pistons?
For the BBC5205-STD pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. However, this may vary based on the specific application and operating conditions, so always consult with your engine builder for precise measurements.
What compression ratio can I expect with the BBC5205-STD pistons and 118cc heads?
The BBC5205-STD pistons provide a compression ratio of approximately 9.7:1 when used with 118cc heads. Keep in mind that actual compression can vary based on factors like head gasket thickness and combustion chamber modifications.
Do I need to perform any machining on the BBC5205-STD pistons before installation?
Typically, the BBC5205-STD pistons will require proper ring gap setting and may need to be checked for clearance with the cylinder head and valves. Always ensure the pistons are fitted correctly to avoid any interference.
What is the weight of the BBC5205-STD pistons and how does it affect performance?
The BBC5205-STD pistons weigh 642 grams. While heavier pistons can provide stability at high RPM, they may also affect acceleration and throttle response. It's important to balance the rotating assembly for optimal performance.
What type of valve reliefs do the BBC5205-STD pistons have?
The BBC5205-STD pistons feature one valve relief with a slant design. This is intended to provide clearance for the valves while maintaining strength in the piston structure.
