Olds 455 Dish -12cc All 6 deg Olds 4.165 bore, 4.250 stroke, 6.735 rod (CP Bullets BO7020-040)
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|
Make |
Oldsmobile |
|
Engine Type |
Oldsmobile |
|
Part Number |
BO7020-040 |
|
Bore (in) |
4.165 |
|
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 |
10.4 |
|
Pin |
.984 x 2.500 |
|
Ring Thickness |
1.5 x 1.5 x 3.0mm |
|
VR Depth |
N/A |
|
Cubic Inch |
463 |
|
Piston Weight |
551 |
|
Style |
Dish |
|
Valve Reliefs |
None |
|
Gas Port |
No |
| Product Name | Olds 455 Dish -12cc All 6 deg Olds 4.165 bore, 4.250 stroke, 6.735 rod (CP Bullets BO7020-040) |
|---|---|
| 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 compression ratio with the BO7020-040 pistons in an Olds 455 engine?
The BO7020-040 pistons provide a compression ratio of approximately 10.4:1 when used with an 80cc head. Ensure that your engine's specific configuration and combustion chamber volume are considered for accurate calculations.
What bore and stroke specifications are compatible with the BO7020-040 pistons?
These pistons are designed for a bore of 4.165 inches and a stroke of 4.250 inches, making them suitable for the Oldsmobile 455 engine configuration.
What is the recommended pin size for the BO7020-040 pistons?
The BO7020-040 pistons use a pin size of .984 inches by 2.500 inches. Ensure that your conrods are compatible with this pin size for proper fitment.
What is the weight of the BO7020-040 pistons?
Each BO7020-040 piston weighs 551 grams. This weight should be considered during the balancing process of your engine's rotating assembly.
Are there any specific machining requirements for the BO7020-040 pistons?
Yes, ensure that the pistons are fitted with the correct bore clearance and that the ring gaps are set according to your engine build specifications. Proper machining will help achieve optimal performance and reliability.
