GM Hemispherical Heads
Designed and Fully CNC Machined By Sonny's

2006 SAR/BRODIX BB-5 390CC MAX FLOW HEADS
  •   LABOR

    • CNC machined castings

    • Install/fit bronze guides

    • Machine for larger valves

    • Precision, multi-angle valve job and equalize seat depth

    • Full competition port, polish and flow test

    • Hand contoured by one of our cylinder head experts

    • Machined for Vasco-Jet springs and teflon seals

    • Mill for compression

    • Pressure check

    • Correct spring height and assemble

PARTS

• Manley “Severe Duty” stainless steel valves

• Manley titanium 10 degree retainers

• Manley 10 deg hardened locks

• Manley hardened spring cups

• Manley Vasco-jet springs

• Manley 8740 rocker studs

• Comp guide plates

• Teflon valve seals

• 11/32” bronze guides

• Chamber volume 113.5cc

• In. runner vol.: 406 cc

• Ex. runner vol.: 149 cc

• Peak in. flow: 439 cfm @ .900” lift

• Peak ex. flow: 311 cfm @ .800” lift with 28” H2O

• Actual intake sq. inches 1.800 x 2.520 = 4.536


Fully race prepared CNC ported castings $4,075.00

Race ready fully assembled heads $4,920.00