Olds 455 Dish -12cc All 6 deg Olds 4.155 bore, 4.250 stroke, 6.735 rod (CP Bullets BO7020-030)
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|
Make |
Oldsmobile |
|
Engine Type |
Oldsmobile |
|
Part Number |
BO7020-030 |
|
Bore (in) |
4.155 |
|
Stroke (in) |
4.25 |
|
Rod Length (in) |
6.735 |
|
Comp Height |
1.74 |
|
Head Type |
Stock / Edel |
|
Head CC |
80 |
|
Dome / Dish Height |
-0.076 |
|
Dom/Dish CC |
-12 |
|
Compression Ratio |
10.3 |
|
Pin |
.984 x 2.500 |
|
Ring Thickness |
1.5 x 1.5 x 3.0mm |
|
VR Depth |
N/A |
|
Cubic Inch |
461 |
|
Piston Weight |
551 |
|
Style |
Dish |
|
Valve Reliefs |
None |
|
Gas Port |
No |
| Product Name | Olds 455 Dish -12cc All 6 deg Olds 4.155 bore, 4.250 stroke, 6.735 rod (CP Bullets BO7020-030) |
|---|---|
| Brands | CP Carrillo |
| Engine | Olds |
| Make | Olds |
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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 BO7020-030 pistons?
For the BO7020-030 pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. However, it's crucial to verify this with your specific engine build and ensure proper fitment.
What compression ratio can I expect with the BO7020-030 pistons?
The BO7020-030 pistons are designed to achieve a compression ratio of approximately 10.3:1 when used with an 80cc head. Actual compression may vary based on head gasket thickness and other factors.
What ring gap specifications should I use for the BO7020-030 pistons?
For the BO7020-030 pistons, a common starting point for ring gaps is 0.004" per inch of bore for the top rings and 0.005" per inch of bore for the second rings. Adjustments may be necessary based on your specific application and intended use.
Are there any specific machining requirements for the BO7020-030 pistons?
Yes, the BO7020-030 pistons may require careful attention to bore size and ring groove specifications. Ensure that the cylinder bores are honed to the correct size and finish to accommodate the pistons properly.
What is the weight of the BO7020-030 pistons and how does it affect performance?
The BO7020-030 pistons weigh 551 grams each. While this weight is typical for performance applications, it's important to consider the overall rotating assembly balance and how it may impact engine RPM and responsiveness.
