RHS Pro Action LS Cathedral Port Cylinder Head with 0.660-Inch Lift Springs; Un-Assembled (10-13 4.8L Sierra 1500; 99-13 5.3L Sierra 1500; 04-13 6.0L Sierra 1500)

Ready For More Power. Sierra 1500 Pro Action LS Cathedral Port Cylinder Head comes unassembled and ready for added modifications on your LS-based engine. Easily upgrade the camshaft, springs, and valve covers.

Made To High Standards. A high-performance engine needs well-made replacement parts for optimal performance durability. Made from high-quality materials, these cylinder heads will provide you with a long lifespan and precision tolerances that only RHS can offer. Take your Sierra 1500 to the next level with Pro Action LS Cathedral Port Cylinder Heads.

Crafted From Durable Aluminum. The Sierra 1500 Pro Action LS Cathedral Port Cylinder Head is the perfect way to bump up engine power. This high-end aluminum cylinder head comes assembled and ready for installation on most late model LS-based engines. Get the most out of your truck a set of RHS Heads.

State Of The Art Casting. The Sierra 1500 Pro Action LS Cathedral Port Cylinder Head is made with State of the art Clean Cast Technology. It ensures that you get high-quality parts with no defects or weaknesses, even in high horsepower applications. This means achieving the best performance possible!

Stock and Modified Engines. RHS Pro Action cathedral port aluminum cylinder heads are an excellent choice for any performance or stock engine build. No matter if you want to add power now or have room for expansion later on, aftermarket heads are a must-have upgrade.

Dual Style Spark Plug Seat. Want to take on higher towing capacity? Does more horsepower top your must-have list? A new Pro Action LS Cathedral Port Cylinder Head is ideal. The engineers at RHS allow for tapered style spark plugs(stock applications) and flat style(racing applications) to be used when building the engine.

Application. Pro Action LS Cathedral Port Cylinder Heads are specifically built to fit LS-based engines including the 4.8L, 5.3L, and 6.0L Vortec V8’s found on the 1999-2013 GMC Sierra 1500 trucks. Have a look at the full compatibility list below.

Fitment:

• 1999 GMC Sierra 1500
• 2000 GMC Sierra 1500
• 2001 GMC Sierra 1500
• 2002 GMC Sierra 1500
• 2003 GMC Sierra 1500
• 2004 GMC Sierra 1500
• 2005 GMC Sierra 1500
• 2006 GMC Sierra 1500
• 2007 GMC Sierra 1500
• 2008 GMC Sierra 1500
• 2009 GMC Sierra 1500
• 2010 GMC Sierra 1500
• 2011 GMC Sierra 1500
• 2012 GMC Sierra 1500
• 2013 GMC Sierra 1500

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