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Brodix 9991009

-18X Series Top End Kit Standard Exhaust Port

Brodix 9991009
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158-9991009

made in usa
jegs shipping
FREE Shipping
Ships 12/28/16 if Ordered Today
Brodix 9991009 -18X Series Top End Kit Standard Exhaust Port $4,213.55
-18X Series Top End Kit
  • Standard Exhaust Port
  • 245cc 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 9991009 Details

    -18X Series Cylinder Heads

  • 68cc Combustion Chambers
  • Standard Exhaust Ports
  • Small Block Chevy Top End Kits Include:
  • Complete Cylinder Heads
  • HV 1800 Intake Manifold (4150 Series)
  • Tall Cast Aluminum Valve Covers with Studs and Nuts
  • Valve Cover, Intake, Exhaust, Carburetor and Head Gaskets
  • Head Bolts with Washers
  • Intake Bolts with Washers
  • Spark Plugs
  • Brodix Hat

    Cylinder Head Specifications
  • Intake Port Volume: 245cc
  • 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: Fel-Pro p/n 375-1406, Cometic p/n 245-C5415 (Standard 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: Standard and Stahl
  • 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)

  • Specifications:

    Manufacturer's Part Number:
    9991009

    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''
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