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

SAR/BRODIX BB-5 390CC SPORTSMAN HEADS
  •   LABOR

    • CNC machined castings

    • Install/fit bronze guides

    • Machine for larger valve springs

    • Bowl porting

    • CNC Port chambers

    • Port match intake and exhaust

    • Machine for Vasco-Jet spring (1.625”)

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

    • Hand contoured by one of our Flow Specialist

    • Mill to true

    • Pressure checked

    • Correct spring height and assemble

PARTS

• Manley & Brodix stainless steel valves

• Manley Vasco-jet valve springs

• Manley titanium 10 degree retainers

• Manley 10 deg hardened locks

• Manley hardened spring cups

• Teflon valve seals

• Rocker studs and pushrod guide plate

• 11/32 bronze guides

• Chamber vol. 119cc

• Intake runner vol. 395cc

• Exhaust runner vol. 123cc

• Peak intake flow 418 cfm @ .800”

• Peak exhaust flow 275 cfm @ .800” with 28” H2O

• Actual intake sq. inches 1.800 x 2.520 = 4.530

Fully race prepared CNC ported castings $3,020.00

Race ready fully assembled heads $3,835.00