CP Bullet LS Pistons 4.125" Stroke (15° Heads)
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CP Bullet Series Pistons
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Suit Chevrolet LS 4.125" Stroke (15°Heads)
| Part Number | Bore | Stroke | Rod | Comp Height | Head Type | Head CC | Dome Height | Dish / Dome | C/R | Pin Dia | VR Depths | Weight | Type | VR |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| BLS1129-005 | 4.070 | 4.125 | 6.125 | 1.050 | Std 15 deg/ L92 | 68.0 | .175 | +9.5cc | 13.5:1 | .927 x 2.250 | .200 / SP | 448 | Dome | 2 VR's |
| BLS1129-STD | 4.065 | 4.125 | 6.125 | 1.050 | Std 15 deg/ L92 | 68.0 | .175 | +9.5cc | 13.5:1 | .927 x 2.250 | .200 / SP | 448 | Dome | 2 VR's |
| BLS1132-030 | 4.030 | 4.125 | 6.125 | 1.050 | Std 15 deg/ L92 | 68.0 | F.T. | -2.7cc | 11.5:1 | .927 x 2.250 | .175 / SP | 448 | FT | 2 VR's |
| BLS1132-065 | 4.065 | 4.125 | 6.125 | 1.050 | Std 15 deg/ L92 | 68.0 | F.T. | -2.7cc | 11.7:1 | .927 x 2.250 | .175 / SP | 449 | FT | 2 VR's |
| BLS1132-070 | 4.070 | 4.125 | 6.125 | 1.050 | Std 15 deg/ L92 | 68.0 | F.T. | -2.7cc | 11.7:1 | .927 x 2.250 | .175 / SP | 449 | FT | 2 VR's |
| BLS1132-075 | 4.075 | 4.125 | 6.125 | 1.050 | Std 15 deg/ L92 | 68.0 | F.T. | -2.7cc | 11.8:1 | .927 x 2.250 | .175 / SP | 450 | FT | 2 VR's |
| BLS1132-080 | 4.080 | 4.125 | 6.125 | 1.050 | Std 15 deg/ L92 | 68.0 | F.T. | -2.7cc | 11.8:1 | .927 x 2.250 | .175 / SP | 450 | FT | 2 VR's |
| BLS1134-005 | 4.005 | 4.125 | 6.125 | 1.050 | Std 15 deg/ L92 | 68.0 | -.165 | -23.9cc | 9.2:1 | .927 x 2.250 | .175 / SP | 403 | Dish | 2 VR's |
| BLS1134-030 | 4.030 | 4.125 | 6.125 | 1.050 | Std 15 deg/ L92 | 68.0 | -.1455 | -21.5cc | 9.5:1 | .927 x 2.250 | .175 / SP | 406 | Dish | 2 VR's |
| BLS1134-125 | 4.125 | 4.125 | 6.125 | 1.065 | Std 15 deg/ L92 | 68.0 | -.175 | -30cc | 9.4:1 | .927 x 2.250 | .265 / SP | 440 | Dish | 2 VR's |
Please note: All care is taken to provide the correct specifications; however Spool Imports is not responsible for any incorrect specifications listed. It is important to confirm your specifications with other available manufacturer resources before ordering any parts for an engine. If you need more information please contact [email protected]
Features Included:
- Pistons manufactured from 2618 alloy for strength and durability
- Balanced to + or – 1 gram
- Dual forced pin oilers
- Contact reduction grooves
- Accumulator Grooves
- Contemporary ring set included (Comes standard with 1.5mm x 1.5mm x 3.0mm ring pack that consists of High-grade Steel Gas Nitrided barrel faced tops with Taper Hook Groove Napier second rings and a 3-piece soft nitrided rail flex vent oils, specially designed for severe duty applications such as nitrous blowers and turbo engines.)
- Forged side relief
- Chromoly wrist pins with wire locks
- FEA designed forging
- Tight tolerances
- USA made
| Product Name | CP Bullet LS Pistons 4.125" Stroke (15° Heads) |
|---|---|
| Brands | CP Carrillo |
| Engine | Chev LS (15° Heads), GM / LS |
| Make | Chevrolet, GM, Holden, LS Chev |
Delivery & Freight
We are an Australian-based company that ships items nationally and internationally, usually within 48 hours of receiving your order. High-value items shipped internationally are sent via DHL Express, while lower-value items are sent via Australia Post Express unless otherwise instructed.
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Disclaimer:
Product images are for description purposes only. Actual product may vary.
Shipping calculations available at checkout.
If you are unsure, get in touch by emailing [email protected], messaging us on Facebook, or phoning us at +61 7 5645 1333 (8am to 2pm AET).
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 size for the CP Bullet LS Pistons 4.125"?
The recommended bore size for the CP Bullet LS Pistons is 4.070" for the BLS1129-005 and BLS1129-STD part numbers, while the BLS1132 series varies from 4.030" to 4.080" depending on the specific piston design.
What compression ratio can I expect with these pistons?
The compression ratio for the CP Bullet LS Pistons varies by part number. For example, the BLS1129-005 and BLS1129-STD provide a compression ratio of 13.5:1, while the BLS1134 series offers lower ratios around 9.2:1 to 9.5:1. Ensure to verify your specific setup for accurate calculations.
What type of ring set is included with these pistons?
These pistons come standard with a contemporary ring set consisting of a 1.5mm x 1.5mm x 3.0mm configuration. The top rings are high-grade steel gas nitrided, designed for severe duty applications including nitrous and turbo setups.
Do these pistons require any specific machining before installation?
Yes, the pistons require correct bore clearance and ring gap settings as determined by the engine builder. Ensure that the cylinder bores are honed to the appropriate size for optimal performance and longevity.
What material are the CP Bullet LS Pistons made from?
The CP Bullet LS Pistons are manufactured from 2618 alloy, known for its strength and durability, making them suitable for high-performance applications.
