Chevy LS7 Flat Top -4.6cc All 12 deg LS7/ 4.125 bore, 4.000 stroke, 6.077 rod 11.2 to 1 Comp with 70cc head (CP Bullets BLS1202-STD)
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|
Make |
Chevrolet |
|
Engine Type |
LS7 Series |
|
Part Number |
BLS1202-STD |
|
Bore (in) |
4.125 |
|
Stroke (in) |
4 |
|
Rod Length (in) |
6.077 |
|
Comp Height |
1.163 |
|
Head Type |
LS7 |
|
Head CC |
70 |
|
Dome / Dish Height |
FT |
|
Dom/Dish CC |
-4.6 |
|
Compression Ratio |
11.2 |
|
Pin |
.927 x 2.250 |
|
Ring Thickness |
1.5 x 1.5 x 3.0mm |
|
VR Depth |
-.220 / -.161 |
|
Cubic Inch |
427 |
|
Piston Weight |
456 |
|
Style |
FT |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Chevy LS7 Flat Top -4.6cc All 12 deg LS7/ 4.125 bore, 4.000 stroke, 6.077 rod 11.2 to 1 Comp with 70cc head (CP Bullets BLS1202-STD) |
|---|---|
| Brands | CP Carrillo |
| Engine | GM / LS |
| Make | Chevrolet, GM, Holden, LS Chev |
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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 BLS1202-STD pistons?
The BLS1202-STD pistons are designed for a compression ratio of 11.2:1 when used with a 70cc LS7 head. Ensure that your engine's overall setup, including camshaft and fuel quality, is compatible with this compression ratio for optimal performance.
What machining considerations should I keep in mind when using these pistons?
When installing the BLS1202-STD pistons, ensure that the bore clearance is set correctly according to your engine's specifications. Additionally, check that the ring gaps are properly set, as this is crucial for performance and reliability.
What is the weight of the BLS1202-STD pistons, and how does it affect performance?
The BLS1202-STD pistons weigh 456 grams each. This weight is suitable for high-performance applications, but it's important to balance the entire rotating assembly to minimise vibrations and ensure smooth operation at high RPM.
Do the BLS1202-STD pistons require specific valve reliefs?
Yes, the BLS1202-STD pistons feature two valve reliefs to accommodate LS7 engine configurations. Ensure that your cylinder heads and camshaft are compatible to prevent any interference during operation.
What type of pin is used with the BLS1202-STD pistons?
The BLS1202-STD pistons use a .927 x 2.250 inch pin. Make sure to verify that your connecting rods are compatible with this pin size for proper fitment.
