5/16 Steel Exhaust Valve Guide Upgrade for Power Adder Heads CID Big Block Chevy cylinder heads The heads share the same

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

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

and LME aftermarket intake manifolds

and is designed for classes that must retain 4150 bolt spacing

5/16 Steel Exhaust Valve Guide Upgrade for Power Adder Heads CID Big Block Chevy cylinder heads The heads share the same5 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.