5/16 Steel Exhaust Valve Guide Upgrade for Power Adder Heads CID Big Block Chevy cylinder heads CID Heads 2 Piece manifold

CID Heads 2 Piece manifold conversion

600" lift and over 470CFM at 1" lift

and is designed for classes that must retain 4150 bolt spacing

Valve lengths fur our hydraulic cylinder heads measure 5

Steel Exhaust guides with K Line inserts for the power adder crowd and chamber softening

5/16 Steel Exhaust Valve Guide Upgrade for Power Adder Heads CID Big Block Chevy cylinder heads CID Heads 2 Piece manifold5 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.