Chevy LS7 12° Heads 4.125 bore, 4.125 stroke, 6.125 rod, 1.055 CH, +5cc dome 1.2mm, 1.2mm, 3mm rings (CP Bullets BLSR1201-STD)
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|
Make |
Chevrolet |
|
Engine Type |
LS7 Series |
|
Part Number |
BLSR1201-STD |
|
Bore (in) |
4.125 |
|
Stroke (in) |
4.125 |
|
Rod Length (in) |
6.125 |
|
Comp Height |
1.055 |
|
Head Type |
LS7 |
|
Head CC |
66.5 |
|
Dome / Dish Height |
0.175 |
|
Dom/Dish CC |
5 |
|
Compression Ratio |
13.3 |
|
Pin |
.927 x 2.250 |
|
Ring Thickness |
1.2 x 1.2 x 3.0mm |
|
VR Depth |
-.220 / SP |
|
Cubic Inch |
441 |
|
Piston Weight |
486 |
|
Style |
Dome |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
Yes |
| Product Name | Chevy LS7 12° Heads 4.125 bore, 4.125 stroke, 6.125 rod, 1.055 CH, +5cc dome 1.2mm, 1.2mm, 3mm rings (CP Bullets BLSR1201-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 BLSR1201-STD pistons?
The BLSR1201-STD pistons are designed to achieve a compression ratio of approximately 13.3:1 when used with LS7 cylinder heads with a combustion chamber volume of 66.5cc. Ensure that your engine's overall setup, including head gasket thickness and chamber modifications, is considered to maintain this ratio.
What is the significance of the gas ports on these pistons?
The gas ports on the BLSR1201-STD pistons enhance ring seal and improve performance by allowing combustion gases to pressurise the ring lands. This feature is particularly beneficial for high-performance applications where optimal ring sealing is crucial for power and efficiency.
What machining considerations should I keep in mind when using these pistons?
When installing the BLSR1201-STD pistons, ensure that the bore clearance is set correctly according to your engine's specifications. Additionally, check that the ring gaps are appropriately sized for your application, especially if you plan to run high RPMs or boost levels.
What is the weight of the BLSR1201-STD pistons and how does it affect performance?
The BLSR1201-STD pistons weigh 486 grams each. While this weight is suitable for performance applications, it's essential to balance the entire rotating assembly to minimise vibrations and ensure smooth operation at high RPMs.
Can I use these pistons with aftermarket rods and crankshafts?
Yes, the BLSR1201-STD pistons are compatible with aftermarket rods and crankshafts, provided that the rod length (6.125 inches) and pin size (.927 x 2.250 inches) match your components. Always verify clearances and fitment with your specific engine build.
