Chevy LS7 12° Heads 4.155 bore, 4.000 stroke, 6.125 rod, 1.115 CH, -25cc dish dome 1.2mm, 1.2mm, 3mm rings (CP Bullets BLSR1203-030)

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.

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.

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.

The BLSR1203-030 pistons are designed for a compression ratio of approximately 9.3:1 when used with LS7 heads and a suitable engine setup. Ensure that your engine builder verifies this based on your specific configuration and fuel type.

The -25.13cc dish volume helps to lower the overall compression ratio, making these pistons suitable for applications where lower compression is desired, such as forced induction setups. Always confirm compatibility with your engine's specifications.

The BLSR1203-030 pistons come with 1.2mm x 1.2mm x 3.0mm ring thicknesses. Ensure that your engine builder sets the correct ring gaps according to your application and performance goals.

Each BLSR1203-030 piston weighs 463 grams. This weight can influence engine balance and performance, particularly in high RPM applications. It's crucial to consider this weight in conjunction with the entire rotating assembly for optimal performance.

Yes, these pistons may require specific bore clearances to ensure proper fitment and performance. It's essential to work with your engine builder to verify the correct clearances and ensure the pistons are installed correctly for optimal performance.