If you're on the hunt for some serious power upgrades for your LS1 or LS2, let me tell you about the PRC 225cc As-Cast cylinder heads. These aren't just any heads; they’re crafted right here in the USA, from casting to machining, ensuring top-notch quality every step of the way.

What really sets these heads apart is their flow capability. With a flow bench tested intake port that pushes over 320cfm, they’re ready to handle everything from your everyday street engines with smaller camshafts to full-on race setups. The design is all about maximizing power without sacrificing reliability, especially in stock cube applications. You get that perfect blend of a high-flowing port and a compact chamber, which is a game-changer for boosting your engine's performance.

Here’s what you can expect:

• As-Cast 225cc Intake Runners: These come with CNC machined chambers and valve guides, giving you unmatched flow right out of the box.
• Small Bore Configurations: This feature allows for extra compression while keeping a solid piston to valve clearance—no need to worry about those pesky clearance issues.
• 62cc CNC Machined Chambers: Precision is key, and these chambers are designed to optimize your combustion process.
• Valves: You’re looking at 2.065" hollow stem intake valves and 1.600" stainless exhaust valves, making sure your engine breathes easy.
• Factory Compatibility: These heads utilize factory LS1 rocker arms, so you won’t have to change out your entire setup.
• Spring Kit: Comes with a TSP .660 dual spring kit, featuring PAC valve springs and titanium retainers—because durability matters.

Now, let’s talk fitment. These heads are compatible with a range of vehicles, including:

• Cadillac CTS-V (2004-2007)
• Cadillac Escalade (2005-2014)
• Chevrolet Camaro (1998-2002)
• Chevrolet Corvette (1997-2013)
• Chevrolet Silverado 1500 (1999-2013)
• Chevrolet Suburban (2000-2014)
• Chevrolet Tahoe (2000-2014)
• Chevrolet Trailblazer (2006-2009)
• GMC Sierra 1500 (1999-2013)
• Pontiac Firebird (1998-2002)
• Pontiac GTO (2004-2006)
• And even some universal retrofit options from 1997-2016.

Just a heads up—these are competition use only, so if you’re in California or any state with similar emissions regulations, make sure to double-check that these parts are legal for your setup.

In short, if you’re looking to take your LS engine to the next level, the PRC 225cc As-Cast cylinder heads are a solid choice. They pack a punch without breaking the bank, and you can feel good knowing they’re made right here in the USA.