Chevy LS7 12° Heads 4.125 bore, 4.000 stroke, 6.125 rod, 1.120 CH, -4.6cc Flat Top 1.2mm, 1.2mm, 3mm rings (CP Bullets BLSR1204-STD)
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|
Make |
Chevrolet |
|
Engine Type |
LS7 Series |
|
Part Number |
BLSR1204-STD |
|
Bore (in) |
4.125 |
|
Stroke (in) |
4 |
|
Rod Length (in) |
6.125 |
|
Comp Height |
1.12 |
|
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 |
1.2 x 1.2 x 3.0mm |
|
VR Depth |
-.220 / -.161 |
|
Cubic Inch |
428 |
|
Piston Weight |
469 |
|
Style |
FT |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Chevy LS7 12° Heads 4.125 bore, 4.000 stroke, 6.125 rod, 1.120 CH, -4.6cc Flat Top 1.2mm, 1.2mm, 3mm rings (CP Bullets BLSR1204-STD) |
|---|---|
| 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 compression ratio for the BLSR1204-STD pistons?
The BLSR1204-STD pistons have a compression ratio of 11.2:1 when used with LS7 heads and a 70cc chamber. Ensure that your engine build accounts for this ratio to achieve optimal performance.
What are the specific machining requirements for the BLSR1204-STD pistons?
These pistons typically require the correct bore clearance to be set by the engine builder, as well as appropriate ring gaps. Ensure that the cylinder bore is honed to match the 4.125-inch diameter for proper fitment.
What is the weight of the BLSR1204-STD pistons, and how does it affect performance?
The BLSR1204-STD pistons weigh 469 grams each. Lighter pistons can improve engine response and reduce reciprocating mass, but ensure that your engine's balance and rotating assembly are properly configured to accommodate this weight.
What type of valve reliefs do the BLSR1204-STD pistons have?
The BLSR1204-STD pistons feature two valve reliefs. This design is crucial for clearance with LS7 cylinder heads, especially at higher RPMs, so ensure your camshaft profile is compatible.
What is the significance of the -4.6cc dome volume in the BLSR1204-STD pistons?
The -4.6cc dome volume indicates that these are flat-top pistons, which contribute to the overall compression ratio. This volume is important for calculating the final compression ratio in conjunction with the cylinder head chamber size.
