Brodix Big Block Chevy Big Duke PB-1800 Series Aluminum Cylinder Heads

The PB 1803 series has CNC'd combustion chambers, intake port match, fully blended bowls and valve job. The intake/exhaust ports remain as-cast and delivers outstanding out-of-the-box performance. For the 100% CNC-ported BP PB 1803 series, Brodix contacted the best head porters in the business to incorporate their porting design into a fully CNC ported masterpiece. Copper valve seats and a 55-degree valve seat angle make either head an excellent choice when looking for serious torque and horsepower.
All Big Duke series heads require special pistons, valve covers, head studs, shaft mounted rocker arms, and intake manifold.
Every casting is poured from A-356 virgin aluminum and tested before Brodix utilizes their in-house processes such as finish machining and heat treating to assure that you receive the best products for your hard-earned money. Other features include a thick deck surface that is compatible with nitrous, drilled and tapped holes on the ends for standard drive accessories, phosphorous bronze valve guides and copper valve seats installed. Sold Individually, 1/pkg.

VALVE SPRING   Specs   1.625'' Diameter Valve Spring for Mechanical Roller Lifter Cam Spring Pressure Open: 745 lbs. Spring Pressure Closed: 255 lbs. Installed Height: 2.050'' Max Lift: .800''   1.645'' Diameter Valve Spring for Mechanical Roller Lifter Cam Spring Pressure Open: 945 lbs. Spring Pressure Closed: 330 lbs. Installed Height: 2.100'' Max Lift: .875''