Olds 455 Flat top -2.5cc All 6 deg Olds 4.155 bore, 4.250 stroke, 6.735 rod (CP Bullets BO7040-030)
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|
Make |
Oldsmobile |
|
Engine Type |
Oldsmobile |
|
Part Number |
BO7040-030 |
|
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 |
FT |
|
Dom/Dish CC |
-2.5 |
|
Compression Ratio |
11.3 |
|
Pin |
.984 x 2.500 |
|
Ring Thickness |
1.5 x 1.5 x 3.0mm |
|
VR Depth |
-.100 / -.100 |
|
Cubic Inch |
461 |
|
Piston Weight |
563 |
|
Style |
FT |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Olds 455 Flat top -2.5cc All 6 deg Olds 4.155 bore, 4.250 stroke, 6.735 rod (CP Bullets BO7040-030) |
|---|---|
| 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 BO7040-030 pistons?
For the Olds 455 Flat top pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. However, final clearance should be determined based on your specific engine build and intended use.
What compression ratio can I expect with the BO7040-030 pistons?
These pistons provide a compression ratio of approximately 11.3:1 when used with 80cc heads. Ensure that your engine is properly tuned to handle this compression level.
Are there any specific machining requirements for the BO7040-030 pistons?
Yes, the pistons may require careful attention to ring gap settings and bore finish. It's essential to hone the cylinder walls to the correct specifications to ensure optimal performance and longevity.
What is the weight of the BO7040-030 pistons and how does it affect performance?
The BO7040-030 pistons weigh 563 grams each. This weight is suitable for high-performance applications, but keep in mind that lighter pistons can improve engine response and reduce reciprocating mass.
Can I use these pistons with aftermarket heads?
Yes, the BO7040-030 pistons are compatible with both stock and aftermarket heads, such as Edelbrock. Ensure that the head design and combustion chamber volume are considered to achieve the desired compression ratio.
