Big Block Chevy -26cc Dish 4.500 Bore 4.500 stroke 6.700 rod, 8.5 to 1 with 118cc head (CP Bullets BBC5206-STD)
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|
Make |
Chevrolet |
|
Engine Type |
Big Block |
|
Part Number |
BBC5206-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 |
0.132 |
|
Dom/Dish CC |
-25.69 |
|
Compression Ratio |
8.5 |
|
Pin |
.990 x 2.930 |
|
Ring Thickness |
1/16 x 1/16 x 3/16 in. |
|
VR Depth |
-0.32 |
|
Cubic Inch |
573 |
|
Piston Weight |
635 |
|
Style |
Dish |
|
Valve Reliefs |
1 VR with Slant |
|
Gas Port |
No |
| Product Name | Big Block Chevy -26cc Dish 4.500 Bore 4.500 stroke 6.700 rod, 8.5 to 1 with 118cc head (CP Bullets BBC5206-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 BBC5206-STD pistons?
The recommended bore clearance for the BBC5206-STD pistons typically ranges from 0.0030" to 0.0040". It's crucial to check with your engine builder as specific clearances may vary based on your application and machining tolerances.
What compression ratio can I expect with these pistons and a 118cc head?
With the BBC5206-STD pistons, a 118cc head will yield a compression ratio of approximately 8.5:1. However, actual compression can vary based on factors such as head gasket thickness and combustion chamber modifications.
Do I need to modify my cylinder heads for valve clearance with these pistons?
Yes, you may need to check for valve clearance when using the BBC5206-STD pistons, especially since they feature a single valve relief. Ensure to measure clearance during assembly to avoid potential interference.
What is the weight of the BBC5206-STD pistons and how does it affect engine balance?
The BBC5206-STD pistons weigh 635 grams each. It's important to balance these pistons with the rest of the rotating assembly to ensure optimal engine performance and reliability.
What type of rings are included with the BBC5206-STD pistons?
The BBC5206-STD pistons come with 1/16 x 1/16 x 3/16 inch rings. Ensure that the ring gaps are set correctly according to your engine's specifications for optimal performance.
