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

2006 SONNY'S 14.5 DEGREE BRODIX PONTIAC HEADS FOR MARINE APPLICATIONS

feature list

  • At Sonny's all head porting is done in-house. We use a state of the art 5 axis CNC vertical machining center, which can produce precision work to programmed “blue print” specs.

    This unique cylinder head was designed by Sonny's for 500+ cu. in. engines. These cylinder heads are available in 4.840 and 4.900 bore spacing. We offer these heads with Ductile seats and Ampco 45 replaceable drive-in step guides. These Pontiac castings incorporate the heart shape combustion chambers and spread port design intake runners.

    We have designed a one-piece rocker bar for stability and endurance. SAR will also supply you with custom sheet metal billet rail valve covers and cast or sheet metal intakes.

    14.5 Degree Pontiac w/4.840" B.S.

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    14.5 degree Pontiac with 4.840" B.S.
  •   4.600” bore chamber 80 CC
    Intake valve 2.480”
    Exhaust valve 1.900”
    Intake flow 538 cfm @ .800”
    514 cfm @ .700” With 28” H2O
    Intake runner volume 494CC
    Exhaust runner volume 184CC
    Intake valve angles 14.5 degree x 4 degree

    Actual intake square in. 1.90 x 2.53 = 4.8 – 3/4R = 4.32

4.840 Race ready fully assembled heads   $8,375.00
Blown alcohol applications   $8,710.00