Chevy LS7 12° Heads 4.130 bore, 4.125 stroke, 6.125 rod, 1.055 CH, -5cc Flat Top 1.5mm, 1.5mm, 3mm rings (CP Bullets BLS1205-005)
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|
Make |
Chevrolet |
|
Engine Type |
LS7 Series |
|
Part Number |
BLS1205-005 |
|
Bore (in) |
4.13 |
|
Stroke (in) |
4.125 |
|
Rod Length (in) |
6.125 |
|
Comp Height |
1.055 |
|
Head Type |
LS7 |
|
Head CC |
70 |
|
Dome / Dish Height |
FT |
|
Dom/Dish CC |
-4.6 |
|
Compression Ratio |
11.6 |
|
Pin |
.927 x 2.250 |
|
Ring Thickness |
1.5 x 1.5 x 3.0mm |
|
VR Depth |
-.220 / SP |
|
Cubic Inch |
442 |
|
Piston Weight |
457 |
|
Style |
FT |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Chevy LS7 12° Heads 4.130 bore, 4.125 stroke, 6.125 rod, 1.055 CH, -5cc Flat Top 1.5mm, 1.5mm, 3mm rings (CP Bullets BLS1205-005) |
|---|---|
| Brands | CP Carrillo |
| Engine | GM / LS |
| Make | Chevrolet, GM, Holden, LS Chev |
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 bore clearance for the BLS1205-005 pistons?
For the BLS1205-005 pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. However, this can vary based on the specific application and engine builder preferences, so always consult with your engine builder for the best fit.
What compression ratio can I expect with the BLS1205-005 pistons in an LS7 engine?
The BLS1205-005 pistons provide a compression ratio of approximately 11.6:1 when used with LS7 heads that have a 70cc chamber. Ensure that your engine's overall assembly and fuel quality are suitable for this compression level.
What is the weight of the BLS1205-005 pistons and how does it affect performance?
The BLS1205-005 pistons weigh 457 grams each. Lighter pistons can improve engine response and RPM capabilities, but it's crucial to balance them with the rest of the rotating assembly to maintain reliability.
Do the BLS1205-005 pistons require any specific machining?
Yes, the BLS1205-005 pistons may require specific machining for proper fitment, including honing of the bore and setting the ring gaps. Always follow the manufacturer's guidelines and consult with your engine builder for precise machining requirements.
What type of rings are included with the BLS1205-005 pistons?
The BLS1205-005 pistons come with 1.5mm x 1.5mm x 3.0mm rings. Ensure that the ring gaps are set correctly according to your engine's application to optimise performance and reliability.
