Chevy LS7 12° Heads 4.130 bore, 4.125 stroke, 6.125 rod, 1.055 CH, +5cc dome 1.2mm, 1.2mm, 3mm rings (CP Bullets BLSR1201-005)
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|
Make |
Chevrolet |
|
Engine Type |
LS7 Series |
|
Part Number |
BLSR1201-005 |
|
Bore (in) |
4.13 |
|
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 |
442 |
|
Piston Weight |
486 |
|
Style |
Dome |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
Yes |
| Product Name | Chevy LS7 12° Heads 4.130 bore, 4.125 stroke, 6.125 rod, 1.055 CH, +5cc dome 1.2mm, 1.2mm, 3mm rings (CP Bullets BLSR1201-005) |
|---|---|
| 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 compression ratio for the BLSR1201-005 pistons?
The BLSR1201-005 pistons are designed to achieve a compression ratio of approximately 13.3:1 when used with LS7 cylinder heads that have a combustion chamber volume of 66.5cc. Ensure that your engine's overall setup, including head gasket thickness and combustion chamber modifications, is considered for accurate compression calculations.
What are the specific machining requirements for the BLSR1201-005 pistons?
When installing the BLSR1201-005 pistons, it's essential to ensure proper bore clearance as well as set the ring gaps according to your engine's specifications. The pistons should be fitted to a bore size of 4.130 inches, and the builder should verify that the piston-to-wall clearance is within the recommended range for performance applications.
What type of pin is used with the BLSR1201-005 pistons?
The BLSR1201-005 pistons use a .927-inch diameter pin with a length of 2.250 inches. Ensure that your connecting rods are compatible with this pin size for proper fitment.
What is the weight of the BLSR1201-005 pistons, and how does it affect performance?
The BLSR1201-005 pistons weigh 486 grams each. While lighter pistons can improve engine response and reduce reciprocating mass, it's crucial to balance them with the rest of the rotating assembly to maintain reliability and performance at high RPMs.
Do the BLSR1201-005 pistons include gas ports, and what is their purpose?
Yes, the BLSR1201-005 pistons are equipped with gas ports. These ports help to improve ring seal and reduce blow-by by allowing combustion gases to pressurise the ring pack, which can enhance performance, especially in high-boost applications.
