Chevy LS3 Flat top -2.7cc All std 15 deg/ L92 4.065 bore, 3.622 stroke, 6.098 rod with .945 pin 10.3 to 1 Comp with 68cc head (CP Bullets BLS1139-STD)
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|
Make |
Chevrolet |
|
Engine Type |
LS Series |
|
Part Number |
BLS1139-STD |
|
Bore (in) |
4.065 |
|
Stroke (in) |
3.622 |
|
Rod Length (in) |
6.098 |
|
Comp Height |
1.335 |
|
Head Type |
Std 15 deg/ L92 |
|
Head CC |
68 |
|
Dome / Dish Height |
FT |
|
Dom/Dish CC |
-2.7 |
|
Compression Ratio |
10.3 |
|
Pin |
.945 x 2.250 |
|
Ring Thickness |
1.5 x 1.5 x 3.0mm |
|
VR Depth |
-.175 / SP |
|
Cubic Inch |
376 |
|
Piston Weight |
485 |
|
Style |
FT |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Chevy LS3 Flat top -2.7cc All std 15 deg/ L92 4.065 bore, 3.622 stroke, 6.098 rod with .945 pin 10.3 to 1 Comp with 68cc head (CP Bullets BLS1139-STD) |
|---|---|
| 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 bore clearance for the BLS1139-STD pistons?
For the BLS1139-STD pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. However, this can vary based on specific engine build conditions, so it's essential to consult with your engine builder for precise measurements.
What compression ratio can I expect with the BLS1139-STD pistons and a 68cc head?
The BLS1139-STD pistons provide a compression ratio of 10.3:1 when used with a 68cc head. Keep in mind that actual compression can vary based on factors like head gasket thickness and combustion chamber modifications.
What is the weight of the BLS1139-STD pistons, and how does it affect performance?
The BLS1139-STD pistons weigh 485 grams each. Lighter pistons can improve engine response and reduce reciprocating mass, but ensure that your rotating assembly is balanced appropriately to maintain reliability.
Do the BLS1139-STD pistons require any specific machining?
Yes, the BLS1139-STD pistons may require specific machining such as honing of the cylinder bores to achieve the proper clearance. Always verify fitment and clearances with your engine builder before installation.
What type of ring thickness is used with the BLS1139-STD pistons?
The BLS1139-STD pistons use a ring thickness of 1.5mm x 1.5mm x 3.0mm. Ensure that the ring gaps are set according to your engine's specifications for optimal performance.
