CP Bullet LS Pistons 4.125" Stroke (15° Heads)
Part#: BLS1129-005 / Bore: 4.070 / Stroke: 4.125 / Rod: 6.125 / Comp Height: 1.050 / C/R: 13.5:1 / No Pin Upgrade
$1,645.00
Skip to product information
CP Bullet LS Pistons 4.125" Stroke (15° Heads)
$1,645.00
CP Bullet Series Pistons
Try our new LS Piston Finder to help select the right piston. Click here
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 |
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
Available options
- Piston Options: Part#: BLS1129-005 / Bore: 4.070 / Stroke: 4.125 / Rod: 6.125 / Comp Height: 1.050 / C/R: 13.5:1; Part#: BLS1129-STD / Bore: 4.065 / Stroke: 4.125 / Rod: 6.125 / Comp Height: 1.050 / C/R: 13.5:1; Part#: BLS1132-030 / Bore: 4.030 / Stroke: 4.125 / Rod: 6.125 / Comp Height: 1.050 / C/R: 11.5:1; Part#: BLS1132-065 / Bore: 4.065 / Stroke: 4.125 / Rod: 6.125 / Comp Height: 1.050 / C/R: 11.7:1; Part#: BLS1132-070 / Bore: 4.070 / Stroke: 4.125 / Rod: 6.125 / Comp Height: 1.050 / C/R: 11.7:1; Part#: BLS1132-075 / Bore: 4.075 / Stroke: 4.125 / Rod: 6.125 / Comp Height: 1.050 / C/R: 11.8:1; Part#: BLS1132-080 / Bore: 4.080 / Stroke: 4.125 / Rod: 6.125 / Comp Height: 1.050 / C/R: 11.8:1; Part#: BLS1134-005 / Bore: 4.005 / Stroke: 4.125 / Rod: 6.125 / Comp Height: 1.050 / C/R: 9.2:1; Part#: BLS1134-030 / Bore: 4.030 / Stroke: 4.125 / Rod: 6.125 / Comp Height: 1.050 / C/R: 9.5:1; Part#: BLS1134-125 / Bore: 4.125 / Stroke: 4.125 / Rod: 6.125 / Comp Height: 1.065 / C/R: 9.4:1
- Pin Upgrades: No Pin Upgrade; 0.200" 9310 Pins; 0.240" 9310 Pins
Engine build fitment
Chev LS (15° Heads)|GM / LS. Match the selected dimensions, engine generation and rotating assembly specification before machining or assembly.
Installation and BBT workshop support
Confirm finished bore size, piston-to-wall clearance, compression height, pin specification, ring gaps and valve clearance against the supplied piston documentation.
Built by Boost & Tune is an authorised Spool Imports dealer and can assist with component selection, engine assembly and tuning requirements for your build.