Chevy LS7 12° Heads 4.155 bore, 4.000 stroke, 6.125 rod, 1.120 CH, -4.6cc Flat Top 1.2mm, 1.2mm, 3mm rings (CP Bullets BLSR1204-030)
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|
Make |
Chevrolet |
|
Engine Type |
LS7 Series |
|
Part Number |
BLSR1204-030 |
|
Bore (in) |
4.155 |
|
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 |
11.3 |
|
Pin |
.927 x 2.250 |
|
Ring Thickness |
1.2 x 1.2 x 3.0mm |
|
VR Depth |
-.220 / -.161 |
|
Cubic Inch |
434 |
|
Piston Weight |
467 |
|
Style |
FT |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Chevy LS7 12° Heads 4.155 bore, 4.000 stroke, 6.125 rod, 1.120 CH, -4.6cc Flat Top 1.2mm, 1.2mm, 3mm rings (CP Bullets BLSR1204-030) |
|---|---|
| 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 BLSR1204-030 pistons?
For the BLSR1204-030 pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. However, final clearance should be determined by the engine builder based on specific application and tolerances.
What compression ratio can I expect with the BLSR1204-030 pistons in an LS7 engine?
The BLSR1204-030 pistons provide a compression ratio of approximately 11.3:1 when used with LS7 heads that have a 70cc chamber. Adjustments may be necessary based on head gasket thickness and any machining done to the heads.
What type of ring gap should I use for the rings on the BLSR1204-030 pistons?
For the 1.2mm rings on the BLSR1204-030 pistons, a general guideline is to set the top ring gap at 0.020" to 0.022" and the second ring gap at 0.018" to 0.020". Always confirm with your specific application and tuning requirements.
Are the BLSR1204-030 pistons suitable for high boost applications?
The BLSR1204-030 pistons can handle moderate boost levels, but reliability will depend on proper tuning, fuel quality, and overall engine assembly. Ensure that the engine is built with adequate supporting components to handle increased pressures.
What is the weight of the BLSR1204-030 pistons and how does it affect performance?
The BLSR1204-030 pistons weigh 467 grams. While this weight is suitable for performance applications, lighter pistons can improve throttle response and reduce reciprocating mass. Consider your specific build goals when selecting piston weight.
