Chevy LS7 12° Heads 4.155 bore, 4.000 stroke, 6.125 rod, 1.115 CH, -25cc dish dome 1.5mm, 1.5mm, 3mm rings (CP Bullets BLS1203-030)
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|
Make |
Chevrolet |
|
Engine Type |
LS7 Series |
|
Part Number |
BLS1203-030 |
|
Bore (in) |
4.155 |
|
Stroke (in) |
4 |
|
Rod Length (in) |
6.125 |
|
Comp Height |
1.115 |
|
Head Type |
LS7 |
|
Head CC |
70 |
|
Dome / Dish Height |
-0.163 |
|
Dom/Dish CC |
-25.13 |
|
Compression Ratio |
9.3 |
|
Pin |
.927 x 2.250 |
|
Ring Thickness |
1.5 x 1.5 x 3.0mm |
|
VR Depth |
-.220 / -.161 |
|
Cubic Inch |
432 |
|
Piston Weight |
450 |
|
Style |
Dish |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Chevy LS7 12° Heads 4.155 bore, 4.000 stroke, 6.125 rod, 1.115 CH, -25cc dish dome 1.5mm, 1.5mm, 3mm rings (CP Bullets BLS1203-030) |
|---|---|
| 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 bore clearance for the BLS1203-030 pistons?
For the BLS1203-030 pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. However, this can vary based on your specific engine build and operating conditions, so always consult with your engine builder for precise specifications.
What compression ratio can I expect with the BLS1203-030 pistons in an LS7 engine?
The BLS1203-030 pistons provide a compression ratio of approximately 9.3:1 when used with LS7 heads. Keep in mind that actual compression can vary based on factors such as head gasket thickness and combustion chamber volume.
What is the significance of the -25cc dish on the BLS1203-030 pistons?
The -25cc dish on the BLS1203-030 pistons helps to lower the compression ratio, making them suitable for applications where forced induction or higher boost levels are planned. This design allows for better detonation resistance under high-performance conditions.
Do I need to modify the cylinder head for clearance with the BLS1203-030 pistons?
The BLS1203-030 pistons feature two valve reliefs designed for LS7 heads, which should provide adequate clearance for most camshaft profiles. However, it's essential to check for clearance with your specific setup, especially if using aftermarket camshafts.
What type of rings come with the BLS1203-030 pistons, and how do they affect performance?
The BLS1203-030 pistons come with 1.5mm, 1.5mm, and 3.0mm rings. This ring configuration is designed to reduce friction and improve sealing, which can enhance performance and efficiency. Proper ring gap settings are crucial for optimal performance and longevity.
