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Brodix 1158100

KC -12 B Series Cylinder Heads 40/60 Valve Spacing


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Estimated ship date 03/27/18 if Ordered Today
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Brodix 1158100 KC -12 B Series Cylinder Heads 40/60 Valve Spacing $3,494.18
KC -12 B Series Cylinder Heads
  • 40/60 Valve Spacing
  • 287cc Intake Ports
  • 61cc Combustion Chambers
  • 2.150'' Intake / 1.600'' Exhaust Valves
  • 1.550'' Dia. Springs - 240# Seat Pressure
  • Titanium Retainers
  • Angle Plug
  • Assembled, 2/pkg.

  • Brodix 1158100 Details

    KC -12 B Series Cylinder Heads

  • 287cc Intake Port Volume
  • 61cc Combustion Chambers
  • 40/60 Valve Centerline
  • CNC Ported
  • Cylinder Head Specifications
  • Intake Port Volume: 287cc (CNC Ported)
  • Combustion Chamber Volume: 61cc
  • Valves: 2.150'' dia. x 5.440'' o.a.l. Intake / 1.600'' dia. x 5.440'' 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: N/A - Shaft System Required
  • Guide Plates: N/A
  • 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: Fel-Pro p/n 375-1209
  • 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 070-234-4723 (12-point with 3/8'' center studs)
  • Spark Plug Specs: 14mm Thread, .750'' (3/4'') Reach, Gasket Seat
  • Valve Angle: 15°
  • Angle Milling: .0065'' per cc
  • Flat Milling: .0055'' per cc
  • Pushrod Slots: 40/60
  • Stud Girdle: N/A
  • Rocker Arms: Shaft System with 40/60 Spacing (Check heads for intake offset) - T&D 2206, Jesel KPS 01204
  • Lifters: .180'' Offset
  • Pistons: Special 15°
  • Pushrods: Special Length
  • Intake Face Angle: 10°
  • Exhaust Pattern: Spread Port - Stahl Header Flange Bolt Pattern
  • 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 1200 (p/n 158-HV1200), HV 1201 (p/n 158-HV1201)

  • Specifications:

    Manufacturer's Part Number:

    Excellent Cylinder Head for Nitrous Builds!
    15° Intake & Exhaust Valve Angles

    In the mid 1980's, Brosix was the first company to offer a ''rolled over'' valve angle cylinder head. Since then, the -12 series cylinder head has won thousands of drag race, late model and sprint car races...AND is still winning races today. Brodix has taken this design even further by adding raised intake ports, specially shaped intake and exhaust ports, some choices of valve spacings, and more efficient combustion chambers. The -12 series cylinder head is available in several port sizes to fulfill your needs. Some heads are available milled and drilled for down nozzle injection. 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. !

    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''