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CNC ported head combinations or complete crate engines like this one:
Boosted & Nitrous-Equipped Engines
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Regardless of whether you have a stock LS engine
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Callies Ultra Enforcer I-Beam Connecting Rods for LS Engines Ignition Coils CNC ported head combinations orAt Borowski Race Engines, we use Callies Ultra rods for a lot of our boosted LS engine builds. Why? Because they survive where others don't. Callies developed the Ultra connecting rod with the design goal of an uncompromised strength to weight ratio. Every Ultra connecting rod is produced from specially formulated Timken Steel 4330 and precision forged for uniform grain flow and consistency. Many geometric nuances are incorporated into the design of