Olds 400 Flat Top -1.44cc All 6 deg Olds 4.060 bore, 3.975 stroke, 6.735 rod (CP Bullets BO7400-060)
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|
Make |
Oldsmobile |
|
Engine Type |
Oldsmobile |
|
Part Number |
BO7400-060 |
|
Bore (in) |
4.06 |
|
Stroke (in) |
3.975 |
|
Rod Length (in) |
7 |
|
Comp Height |
1.885 |
|
Head Type |
Stock / Edel |
|
Head CC |
64 |
|
Dome / Dish Height |
FT |
|
Dom/Dish CC |
-1.4 |
|
Compression Ratio |
12.3 |
|
Pin |
.984 x 2.500 |
|
Ring Thickness |
1.5 x 1.5 x 3.0mm |
|
VR Depth |
-.260 / -.260 |
|
Cubic Inch |
412 |
|
Piston Weight |
502 |
|
Style |
FT |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Olds 400 Flat Top -1.44cc All 6 deg Olds 4.060 bore, 3.975 stroke, 6.735 rod (CP Bullets BO7400-060) |
|---|---|
| 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 BO7400-060 pistons?
For the BO7400-060 pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. This ensures proper expansion and prevents scuffing during operation. Always verify with your specific engine build and conditions.
What compression ratio can I expect with the BO7400-060 pistons?
The BO7400-060 pistons provide a compression ratio of approximately 12.3:1 when used with a 64cc head. This is ideal for high-performance applications, but ensure your fuel quality and tuning can support this level of compression.
What type of ring gaps should I set for the BO7400-060 pistons?
For the BO7400-060 pistons, set the top ring gap around 0.020" to 0.022" and the second ring gap around 0.018" to 0.020". The oil ring gap should be approximately 0.015" to 0.020". Adjust these based on your specific application and operating conditions.
Do I need to modify my cylinder head for clearance with the BO7400-060 pistons?
The BO7400-060 pistons feature two valve reliefs, which should provide adequate clearance for most stock and aftermarket Oldsmobile cylinder heads. However, it's advisable to check for piston-to-valve clearance during assembly, especially if using high-lift camshafts.
What is the weight of the BO7400-060 pistons and how does it affect my engine build?
The BO7400-060 pistons weigh 502 grams each. This weight is suitable for performance applications, but keep in mind that lighter pistons can improve engine response and reduce stress on the rotating assembly. Balance your rotating assembly accordingly.
