5/16 Steel Exhaust Valve Guide Upgrade for Power Adder Heads CID Big Block Chevy cylinder heads Upper Injector location has been

Upper Injector location has been shown in testing to make slightly more power than the lower placement

and is designed for classes that must retain 4150 bolt spacing

The heads share the same optimized valve locations as our record setting BE LS 12D Oval Port Cylinder Heads with 2

The intake port flows 328CFM at

600" lift and over 470CFM at 1" lift

5/16 Steel Exhaust Valve Guide Upgrade for Power Adder Heads CID Big Block Chevy cylinder heads Upper Injector location has been5 16 Steel Exhaust Valve Guide Upgrade with a K Line Valve Guide Liner insert for Power Adder cylinder heads. Steel valve guides better withstand the higher exhaust temperatures experienced in power adder applications.