Chevy LS7 12° Heads 4.155 bore, 4.125 stroke, 6.125 rod, 1.055 CH, -5cc flat top 1.2mm, 1.2mm, 3mm rings (CP Bullets BLSR1205-030)
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|
Make |
Chevrolet |
|
Engine Type |
LS7 Series |
|
Part Number |
BLSR1205-030 |
|
Bore (in) |
4.155 |
|
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 |
1.2 x 1.2 x 3.0mm |
|
VR Depth |
-.220 / -.161 |
|
Cubic Inch |
447 |
|
Piston Weight |
464 |
|
Style |
FT |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Chevy LS7 12° Heads 4.155 bore, 4.125 stroke, 6.125 rod, 1.055 CH, -5cc flat top 1.2mm, 1.2mm, 3mm rings (CP Bullets BLSR1205-030) |
|---|---|
| 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 BLSR1205-030 pistons?
For the BLSR1205-030 pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. However, always verify with your engine builder as clearance may vary based on specific application and operating conditions.
What compression ratio can I expect with the BLSR1205-030 pistons in an LS7 engine?
The BLSR1205-030 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 tuning are optimised for this compression level.
What type of rings are included with the BLSR1205-030 pistons?
The BLSR1205-030 pistons come with 1.2mm x 1.2mm x 3.0mm ring sets. It's important to check that the ring gaps are set correctly for your specific application to ensure optimal performance and reliability.
What is the weight of the BLSR1205-030 pistons, and how does it affect engine performance?
The BLSR1205-030 pistons weigh 464 grams each. Lighter pistons can improve engine response and reduce stress on the rotating assembly, but ensure that your engine is balanced appropriately to accommodate any changes in weight.
Do I need to modify my LS7 heads to fit the BLSR1205-030 pistons?
The BLSR1205-030 pistons feature two valve reliefs designed for LS7 heads. However, it's crucial to verify clearance with your specific camshaft and valve train setup to avoid any interference issues.
