Big BLock Pontiac Dish -25cc All 14 deg heads 4.155 Bore. 4.250 stroke, 6.700 rod 9.7 to 1 comp with 74cc head (CP Bullets BP8000-030)
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|
Make |
Pontiac |
|
Engine Type |
Pontiac |
|
Part Number |
BP8000-030 |
|
Bore (in) |
4.155 |
|
Stroke (in) |
4.25 |
|
Rod Length (in) |
6.7 |
|
Comp Height |
1.395 |
|
Head Type |
Edel /Stock Iron |
|
Head CC |
74 |
|
Dome / Dish Height |
0.1455 |
|
Dom/Dish CC |
-25.11 |
|
Compression Ratio |
9.7 |
|
Pin |
.990 x 2.500 |
|
Ring Thickness |
1.5 x 1.5 x 3.0mm |
|
VR Depth |
-.075 / -.075 |
|
Cubic Inch |
461 |
|
Piston Weight |
502 |
|
Style |
Dish |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Big BLock Pontiac Dish -25cc All 14 deg heads 4.155 Bore. 4.250 stroke, 6.700 rod 9.7 to 1 comp with 74cc head (CP Bullets BP8000-030) |
|---|---|
| Brands | CP Carrillo |
| Engine | Pontiac |
| Make | Pontiac |
Delivery & Freight
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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 BP8000-030 pistons?
The BP8000-030 pistons are designed to achieve a compression ratio of 9.7:1 when used with 74cc heads. Ensure that your engine's setup aligns with this specification for optimal performance.
What are the specific machining requirements for the BP8000-030 pistons?
When installing BP8000-030 pistons, ensure that the bore clearance is set correctly, typically around 0.0030" to 0.0040" for forged pistons. Additionally, check that the ring gaps are adjusted according to your engine's intended use and RPM range.
What is the weight of the BP8000-030 pistons, and how does it affect engine performance?
The BP8000-030 pistons weigh 502 grams. While this weight is suitable for performance applications, consider the overall rotating assembly balance to minimise vibrations and maximise engine efficiency.
Do the BP8000-030 pistons require any specific valve relief considerations?
Yes, the BP8000-030 pistons feature two valve reliefs. Ensure that your cylinder heads and camshaft profile are compatible to avoid any interference during operation.
What type of pin is used with the BP8000-030 pistons?
The BP8000-030 pistons utilise a .990" x 2.500" pin. Make sure to verify the compatibility of your conrods with this pin size for proper fitment.
