Olds 455 Flat top -2.5cc All 6 deg Olds 4.185 bore, 4.250 stroke, 6.735 rod (CP Bullets BO7040-060)
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|
Make |
Oldsmobile |
|
Engine Type |
Oldsmobile |
|
Part Number |
BO7040-060 |
|
Bore (in) |
4.185 |
|
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 |
11.5 |
|
Pin |
.984 x 2.500 |
|
Ring Thickness |
1.5 x 1.5 x 3.0mm |
|
VR Depth |
-.100 / -.100 |
|
Cubic Inch |
468 |
|
Piston Weight |
572 |
|
Style |
FT |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Olds 455 Flat top -2.5cc All 6 deg Olds 4.185 bore, 4.250 stroke, 6.735 rod (CP Bullets BO7040-060) |
|---|---|
| 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 BO7040-060 pistons?
For the BO7040-060 pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. However, final clearance should be determined based on the specific engine build and intended use.
What compression ratio can I expect with the BO7040-060 pistons in my Olds 455 engine?
The BO7040-060 pistons provide a compression ratio of approximately 11.5:1 when used with 80cc heads. Ensure that your engine's overall setup, including head gasket thickness and combustion chamber volume, is taken into account for accurate calculations.
What type of ring set is compatible with the BO7040-060 pistons?
The BO7040-060 pistons are designed to use a ring set with dimensions of 1.5mm x 1.5mm x 3.0mm. Ensure that the rings are properly gapped according to your engine's specifications for optimal performance.
Do I need to modify my cylinder heads for the BO7040-060 pistons?
The BO7040-060 pistons feature two valve reliefs, which should accommodate most stock and aftermarket Olds cylinder heads. However, it's advisable to check for clearance with your specific camshaft and valve train setup to avoid interference.
What is the weight of the BO7040-060 pistons, and how does it affect engine balance?
The BO7040-060 pistons weigh 572 grams each. When building your engine, consider this weight in conjunction with the crankshaft and connecting rods to ensure proper balance of the rotating assembly.
