Big BLock Pontiac Flat Top -9.04cc All 14 deg heads 4.155 Bore. 4.250 stroke, 6.800 rod 11.2 to 1 comp with 72cc head (CP Bullets BP8002-035)
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|
Make |
Pontiac |
|
Engine Type |
Pontiac |
|
Part Number |
BP8002-035 |
|
Bore (in) |
4.155 |
|
Stroke (in) |
4.25 |
|
Rod Length (in) |
6.8 |
|
Comp Height |
1.295 |
|
Head Type |
Edel /Stock Iron |
|
Head CC |
72 |
|
Dome / Dish Height |
FT |
|
Dom/Dish CC |
-9.04 |
|
Compression Ratio |
11.2 |
|
Pin |
.990 x 2.500 |
|
Ring Thickness |
1.5 x 1.5 x 3.0mm |
|
VR Depth |
-.280 / -.280 |
|
Cubic Inch |
461 |
|
Piston Weight |
475 |
|
Style |
FT |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Big BLock Pontiac Flat Top -9.04cc All 14 deg heads 4.155 Bore. 4.250 stroke, 6.800 rod 11.2 to 1 comp with 72cc head (CP Bullets BP8002-035) |
|---|---|
| Brands | CP Carrillo |
| Engine | Pontiac |
| Make | Pontiac |
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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 BP8002-035 pistons?
For the BP8002-035 pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. However, always verify with your engine builder as specific clearances may vary based on your application and machining tolerances.
What compression ratio can I expect with the BP8002-035 pistons and 72cc heads?
The BP8002-035 pistons are designed to achieve an approximate compression ratio of 11.2:1 when used with 72cc cylinder heads. Ensure that your engine is properly tuned and that fuel quality is suitable for high compression applications.
What type of ring gaps should I set for the BP8002-035 pistons?
For the BP8002-035 pistons, ring gaps should be set according to the manufacturer's specifications, typically around 0.020" for the top ring and 0.022" for the second ring. Adjustments may be necessary based on your specific application and operating conditions.
Do I need to modify my cylinder heads for the BP8002-035 pistons?
The BP8002-035 pistons feature two valve reliefs, which should accommodate most standard Pontiac cylinder heads. However, always check for clearance with your specific camshaft and head configuration to avoid any interference.
What is the weight of the BP8002-035 pistons and how does it affect performance?
The BP8002-035 pistons weigh 475 grams each. While this weight is typical for performance applications, lighter pistons can improve engine response and reduce reciprocating mass. Consider your overall engine build and intended use when evaluating piston weight.
