Chevrolet Performance 19417592 - Fast Burn Aluminum SBC Head

New and improved from Chevrolet Performance is the latest version of the Fast Burn aluminum heads for GEN1 Small Block Chevy engines. Updated castings for improved air flow and performance now include LS-style beehive springs that provide the ultimate technology for superior valvetrain control to match today's performance camshaft grinds. These unique performance heads have dual valve cover bolt patterns for the center bolt and perimeter bolt designs to allow an array of choices to meet your requirements. The Chevrolet engineers designed the "Fast Burn" combustion chamber for superior combustion efficiency that maximizes the air/fuel mixture for increased torque and power. The large 210cc intake port provides a broad torque curve to meet most any requirements for a Small Block performance engine build. SDPC suggest the Vortec intake manifolds for proper port alignment. Specifications: Intake Valve 2.000” Lightweight Hollow Stem Exhaust Valve 1.550” Chamber (cc) 62 Intake Port (cc) 210 Exhaust Port (cc) 78 Assembled or Bare Assembled Valve Spring Diameter 1.300” Beehive Max Lift 0.530” Type LS Beehive Spark Plug Size 14mm Reach 0.750” Design Angle Plug Suggested Plug NGK3346 - BR7EF Info and Technical Notes D-Shaped Exhaust Port is Raised 0.200" and Requires Special Headers Use Fel-Pro Exhaust Gasket #1470 0.530" Maximum Valve Lift Equipped with Screw-In Studs for 3/8" Rockers Use Self Aligning Rockers Stock flow figures at 28” H20 Fast Burn  Lift  Intake Exhaust 0.100" 71 49 0.200" 138 90 0.300" 188 128 0.400" 229 145 0.500" 239 158 0.600" 241 168