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

all the while refusing to disclose the weight as its well known that less weight equals improved times and MPH

CNC chamber softening that incorporates the generic radial conical softening like most companies use

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.