Check the listing for details. Stainless 2.000" / 1.55" High Performance LS Valve Set 243 799 317 241 853 806. Condition: New. Listed at 229.99 USD. Michigan Motorsports 2.00"/1.55" Stainless High Performance Valve SetFits 1997-2013 Cathedral Port LS Heads EXCEPT 706 and 862 CastingsCompatible with Casting Numbers 243 799 317 241 853 806Includes 8 x 2.000" Intake Valves and 8 x 1.550" Exhaust ValvesMichigan Motorsports' stainless valves are a great upgrade for your factory LS cylinder heads. Made from high strength 21-4N Stainless Alloy, these one-piece forgings feature hard chrome plated stems and hardened tips for durability. Undercut stems and swirl polishing improve flow over the OEM GM valves and standard aftermarket replacements. These valves are designed to be a direct drop-in replacement for the factory 2.000" Intake Valves and 1.55" Exhaust Valves on the applications listed above and below. Fits Engine Codes: LS1 LS6 LS2 LQ4 LQ9 LS4 LY2 L20 LY5 LMG LMF LH6 LC9 LH8 LH9 L33Michigan Motorsports 2.00"/1.55" Stainless High Performance Valve SetFits 1997-2013 Cathedral Port LS Heads EXCEPT 706 and 862 CastingsCompatible with Casting Numbers 243 799 317 241 853 806Includes 8 x 2.000" Intake Valves and 8 x 1.550" Exhaust ValvesMichigan Motorsports' stainless valves are a great upgrade for your factory LS cylinder heads. Made from high strength 21-4N Stainless Alloy, these one-piece forgings feature hard chrome plated stems and hardened tips for durability. Undercut stems and swirl polishing improve flow over the OEM GM valves and standard aftermarket replacements. These valves are designed to be a direct drop-in replacement for the factory 2.000" Intake Valves and 1.55" Exhaust Valves on the applications listed above and below. Fits Engine Codes: LS1 LS6 LS2 LQ4 LQ9 LS4 LY2 L20 LY5 LMG LMF LH6 LC9 LH8 LH9 L33