Chevrolet Super Series Piston - BBC Dome 540, 555 & 565 Open Chamber - Fits standard Open Chamber & Brodix BB3 Xtra heads, Bore 4.600, CH 1.060, Stroke 4.375, Rod 6.535 (CP Pistons SS5440)
Chevy 305ci Brodix Spec 3.766 Bore 1.550 CH -1.4cc Flat Top Vertical Gas Ports - Lefts & Rights (CP Bullets BCRE2031-030)
Chevy -13.3cc Dish LS All 15°/L92 4.125 bore 3.622 stroke 6.125 rod 1.300 CH 9.5:1 CR with 68cc head (CP Bullets BLS1140-125)
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|
Make |
Chevrolet |
|
Engine Type |
LS Series |
|
Part Number |
BLS1140-125 |
|
Bore (in) |
4.125 |
|
Stroke (in) |
3.622 |
|
Rod Length (in) |
6.125 |
|
Comp Height |
1.3 |
|
Head Type |
Std 15 deg/ L92 |
|
Head CC |
68 |
|
Dome / Dish Height |
-0.085 |
|
Dom/Dish CC |
-13.3 |
|
Compression Ratio |
9.5 |
|
Pin |
.927 x 2.250 |
|
Ring Thickness |
1.5 x 1.5 x 3.0mm |
|
VR Depth |
-.200 / -.155 |
|
Cubic Inch |
387 |
|
Piston Weight |
503 |
|
Style |
Dish |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Chevy -13.3cc Dish LS All 15°/L92 4.125 bore 3.622 stroke 6.125 rod 1.300 CH 9.5:1 CR with 68cc head (CP Bullets BLS1140-125) |
|---|---|
| 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 BLS1140-125 pistons?
The BLS1140-125 pistons are designed for a compression ratio of 9.5:1 when used with a 68cc head. Ensure that your engine's overall setup, including head gasket thickness and combustion chamber volume, aligns with this ratio for optimal performance.
What is the bore and stroke specification for the BLS1140-125 pistons?
These pistons are designed for a bore of 4.125 inches and a stroke of 3.622 inches. It's crucial to ensure that your engine block is machined to these specifications for proper fitment.
What type of valve reliefs do the BLS1140-125 pistons have?
The BLS1140-125 pistons feature two valve reliefs. This design helps accommodate the LS engine's valve train while maintaining the necessary clearance for performance applications.
What is the weight of the BLS1140-125 pistons?
Each BLS1140-125 piston weighs 503 grams. When building your engine, consider the total rotating assembly weight for balance and performance tuning.
What is the pin size and length for the BLS1140-125 pistons?
The BLS1140-125 pistons use a pin size of .927 inches with a length of 2.250 inches. Ensure that your conrods are compatible with these specifications for proper assembly.
