SBC, 350, Wissotta Spec, Flat top, 4.040 bore, 1.560 CH, 3.480 stroke, 5.700 Rod, -6.8cc (CP Bullets BC1021-040W)
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|
Make |
Chevrolet |
|
Engine Type |
Small Block Chevy Wissotta Spec |
|
Part Number |
BC1021-040W |
|
Bore (in) |
4.04 |
|
Stroke (in) |
3.48 |
|
Rod Length (in) |
5.7 |
|
Comp Height |
1.56 |
|
Head Type |
All 23 deg |
|
Head CC |
68 |
|
Dome / Dish Height |
FT |
|
Dom/Dish CC |
-6.9 |
|
Compression Ratio |
9.8 |
|
Pin |
.927 x 2.500 |
|
Ring Thickness |
1.5 x 1.5 x 3.0mm |
|
VR Depth |
-.310 / -.310 |
|
Cubic Inch |
357 |
|
Piston Weight |
452 |
|
Style |
FT |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | SBC, 350, Wissotta Spec, Flat top, 4.040 bore, 1.560 CH, 3.480 stroke, 5.700 Rod, -6.8cc (CP Bullets BC1021-040W) |
|---|---|
| Brands | CP Carrillo |
| Engine | Chev |
| Make | GM |
Delivery & Freight
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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 compression ratio for the SBC 350 with these pistons?
The CP Bullets BC1021-040W pistons provide a compression ratio of approximately 9.8:1 when used with 68cc cylinder heads. This ratio is suitable for performance applications but should be verified based on your specific engine setup and fuel quality.
What machining considerations should I keep in mind when using these pistons?
When installing the BC1021-040W pistons, ensure that the bore clearance is set correctly, typically around 0.0030" to 0.0040" for forged pistons. Additionally, check that the ring gaps are set according to your engine's intended use, as this can affect performance and reliability.
What is the pin size for the BC1021-040W pistons?
The BC1021-040W pistons feature a pin size of 0.927" x 2.500". Ensure that your connecting rods are compatible with this pin size for proper fitment.
Are there any specific requirements for valve reliefs with these pistons?
The BC1021-040W pistons come with two valve reliefs. When selecting camshaft profiles, ensure that the lift and duration do not interfere with the reliefs to avoid piston-to-valve contact.
What is the weight of the BC1021-040W pistons and how does it affect engine balance?
Each BC1021-040W piston weighs 452 grams. When building your engine, consider the total rotating assembly weight and balance it properly to ensure smooth operation and reduce vibrations at high RPM.
