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Brodix 1181000 - Brodix Small Block Chevy -18X Series Aluminum Heads



Brodix 1181000 - Brodix Small Block Chevy -18X Series Aluminum Heads
Brodix 1181000 - Brodix Small Block Chevy -18X Series Aluminum Heads

JEGS Part Number: 158-1181000

-18X Series Cylinder Heads
  • Spread Exhaust Port
  • 244cc Intake Ports
  • 68cc Combustion Chambers
  • 2.140'' Intake / 1.600'' Exhaust Valves
  • 1.550'' Dia. Springs - 240# Seat Pressure
  • Titanium Retainers
  • Angle Plug
  • Assembled, 2/pkg.

    Brodix 1181000 Details

    -18X Series Cylinder Heads

  • 68cc Combustion Chambers
  • Spread Exhaust Ports
  • Cylinder Head Specifications
  • Intake Port Volume: 244cc
  • Combustion Chamber Volume: 68cc
  • Valves: 2.140'' dia. x 5.290'' o.a.l. Intake / 1.600'' dia. x 5.300'' o.a.l. Exhaust ( 11/32'' Stem Diameter )
  • Valve Springs: 1.550'' Diameter - Open Pressure: 550 lbs.; Closed Pressure: 240 lbs.; Installed Height: 1.950''; Max Lift: .700''
  • Spring Retainers: 1.550'' 10° Titanium
  • Rocker Studs: 7/16''
  • Guide Plates: 5/16''
  • Valve Seals: 11/32''
  • Spark Plug Configuration: Angled

    Facts and Related Components
  • Torque Heads: 70 ft-lb.
  • Torque Rocker Studs: 40-45 ft-lb.
  • Intake Gasket: Brodix p/n 158-MG1800, Cometic p/n 245-C3250
  • Head Gasket: Fel-Pro p/n 375-1003 (350ci) / 375-1004 (400ci) or Cometic p/n 245-C5399 (350ci) / 245-C5403 (400ci)
  • Exhaust Gasket: Brodix p/n 158-MG52464 (trim to fit), Cometic p/n 245-C5424 (Spread Port)
  • Head Studs: ARP p/n 070-234-4727 (12-point with 3/8'' center studs)
  • Spark Plug Specs: 14mm Thread, .750'' (3/4'') Reach, Gasket Seat
  • Valve Angle: 18°
  • Angle Milling: .0065'' per cc
  • Flat Milling: .0055'' per cc
  • Pushrod Slots: 40/60
  • Stud Girdle: 40/60 Brodix p/n 158-BR6440
  • Rocker Arms: Standard 7/16 Roller Rockers, Shaft System with 40/60 Spacing
  • Lifters: Standard
  • Pistons: Special 18°
  • Pushrods: Special Length
  • Intake Face Angle: 10° Standard
  • Exhaust Pattern: Stahl only
  • Valve Centerline: 40/60
  • Spring Pockets: 1.550'' Out of the Box, May be cut to 1.625'' - No larger or deeper
  • Accessory Bolt Holes are Drilled
  • Recommended Intake Manifold: Brodix HV 1800 (p/n 158-HV1800) / HV 1801 (p/n 158-HV1801)

  • Brodix Small Block Chevy -18X Series Aluminum Heads

    Big Horsepower Maker for Budget Racers!
    18° Intake & Exhaust Valve Angles

    The Brodix Small Block Chevy -18X Series Aluminum Cylinder Heads offer the best of both worlds, 18-degree horsepower without using expensive shaft rockers or offset lifters. This head offers a dramatic horsepower increase over the previous 23° cylinder head. Several advantages of the -18X are intake ports that flow over 320 cfm out-of-the-box, an intake valve size of 2.140, raised intake ports, and shallow combustion chambers. The -18X is an excellent choice for the budget-minded racer who wants to go fast. 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. The industry standard has been taken to the next level with modernized CNC porting. 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 interlocking valve seats installed. Sold in Pairs. Made in the USA!

      VALVE SPRING   Specs
      1.550'' Diameter Valve Spring for Mechanical Roller Lifter Cam
  • Spring Pressure Open: 550 lbs.
  • Spring Pressure Closed: 240 lbs.
  • Installed Height: 1.950''
  • Max Lift: .700''
  • Brodix 1181000

    Accessory Bolt Holes Drilled
    Yes
    Calculator
    Compression Calculator
    CNC-Machined Combustion Chamber
    No
    CNC-Machined Exhaust Runner
    No
    CNC-Machined Intake Runner
    No
    Combustion Chamber Volume (cc)
    68
    Cylinder Head Finish
    Natural
    Cylinder Head Material
    Aluminum
    Cylinder Head Style
    Assembled
    Damper Spring Included
    Yes
    Exhaust Port Location
    Spread
    Exhaust Port Shape
    D-port
    Exhaust Valve Angle
    18
    Exhaust Valve Diameter (in.)
    1.6
    Exhaust Valves Included
    Yes
    Guideplates Included
    Yes
    Heat Crossover
    No
    Intake Port Location
    Raised
    Intake Runner Volume (cc)
    245
    Intake Valve Angle
    18
    Intake Valve Diameter (in.)
    2.14
    Intake Valves Included
    Yes
    Lock Style
    10 degree
    Locks Included
    Yes
    Machined for O-Ring
    No
    Maximum Valve Lift (in.)
    0.7
    Number of Springs Per Valve
    Dual
    Oiling Style
    Through pushrod
    Outside Diameter of Outer Spring (in.)
    1.55
    Quantity
    Sold as a pair
    Retainer Material
    Titanium
    Retainers Included
    Yes
    Rocker Arm Nut Thread Size (in.)
    7/16/2020
    Rocker Arm Nuts Included
    No
    Rocker Arm Studs Included
    Yes
    Rocker Arms Included
    No
    Spark Plug Style
    Angle
    Steam Holes Drilled
    No
    Valve Cover Mounting Style
    Perimeter bolt
    Valve Guide Material
    Phosphorous bronze
    Valve Guides Included
    Yes
    Valve Seat Machine Style
    3-angle
    Valve Seat Material
    Ductile iron
    Valve Seats Machined
    Yes
    Valve Springs Included
    Yes
    Valve Stem Seals Included
    Yes
    Manufacturer's Part Number:
    1181000
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