Chevy LS7 Flat Top -4.6cc All 12 deg LS7/ 4.130 bore, 4.000 stroke, 6.077 rod 11.2 to 1 Comp with 70cc head (CP Bullets BLS1202-005)
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|
Make |
Chevrolet |
|
Engine Type |
LS7 Series |
|
Part Number |
BLS1202-005 |
|
Bore (in) |
4.13 |
|
Stroke (in) |
4 |
|
Rod Length (in) |
6.077 |
|
Comp Height |
1.163 |
|
Head Type |
LS7 |
|
Head CC |
70 |
|
Dome / Dish Height |
FT |
|
Dom/Dish CC |
-4.6 |
|
Compression Ratio |
11.2 |
|
Pin |
.927 x 2.250 |
|
Ring Thickness |
1.5 x 1.5 x 3.0mm |
|
VR Depth |
-.220 / -.161 |
|
Cubic Inch |
428 |
|
Piston Weight |
456 |
|
Style |
FT |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Chevy LS7 Flat Top -4.6cc All 12 deg LS7/ 4.130 bore, 4.000 stroke, 6.077 rod 11.2 to 1 Comp with 70cc head (CP Bullets BLS1202-005) |
|---|---|
| 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 Chevy LS7 Flat Top pistons?
These pistons are designed to achieve a compression ratio of 11.2:1 when used with 70cc LS7 cylinder heads. Ensure that your engine's overall setup, including camshaft and fuel quality, is compatible with this compression level.
What bore and stroke specifications are compatible with the BLS1202-005 pistons?
The BLS1202-005 pistons are designed for a 4.130-inch bore and a 4.000-inch stroke. It's crucial to ensure that your engine block is machined to these specifications for optimal performance.
What are the pin specifications for these LS7 pistons?
These pistons feature a pin size of .927 inches and a pin length of 2.250 inches. Ensure that your connecting rods are compatible with these pin dimensions for proper fitment.
Do I need to modify the piston for valve clearance?
The BLS1202-005 pistons come with two valve reliefs, but it's essential to check for adequate clearance with your specific camshaft profile and cylinder head setup. Custom machining may be required depending on your engine's configuration.
What is the weight of the BLS1202-005 pistons, and how does it affect performance?
Each piston weighs 456 grams. While lighter pistons can improve throttle response and reduce reciprocating mass, ensure that your engine's balance and rotating assembly are properly configured to accommodate this weight.
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