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Vehicle Info NeededBRODIXPART NUMBER: 158-9992004-3
BB-2 PLUS Series Top End Kit 312cc Intake Ports
$4,13163
Truck Freight
Ships on 09/18/2026
Lowest Price GuaranteeBB-2 PLUS Series Cylinder Heads312cc Intake Port Volume 1.625'' Diameter Valve Springs - 745# Open, 255# Closed Spring Pressure
- BB-2 PLUS Series Top End Kit
- 312cc Intake Ports
- 119cc Combustion Chambers
- 2.250'' Intake / 1.880'' Exhaust Valves
- 1.625'' Dia. Springs - 255# Seat Pressure
- Titanium Retainers
- Assembled Heads
Big Block Chevy Top End Kits Include: - Complete Cylinder Heads
- HV 2000 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 HatCylinder Head Specifications
- Intake Port Volume: 312cc - Rectangle Port
- Combustion Chamber Volume: 119cc
- Valves: 2.250' dia. x 5.218' o.a.l. Intake / 1.880' dia. x 5.394' o.a.l. Exhaust ( 11/32' Stem Diameter )
- Valve Springs: 1.625' Diameter - Open Pressure: 745 lbs.; Closed Pressure: 255 lbs.; Installed Height: 2.050'; Max Lift: .800'
- Spring Retainers: 1.625' 10° Titanium
- Rocker Studs: 7/16'
- Guide Plates: 3/8'
- Valve Seals: 11/32'
- Spark Plug Configuration: AngledFacts and Related Components
- Torque Heads: 70 ft-lb.
- Torque Rocker Studs: 40-45 ft-lb.
- Intake Gasket: Brodix p/n 158-MG2001, Fel-Pro p/n 375-1252-3, Cometic p/n 245-C5428
- Head Gasket: 4.310' Bore - Fel-Pro p/n 375-1027, Cometic p/n 245-C5432; 4.540' Bore - Fel-Pro p/n 375-1017, Cometic p/n 245-C5433
- Exhaust Gasket: Fel-Pro p/n 375-1411 or Cometic p/n 245-C5429
- Head Bolts: ARP p/n 070-135-3606, Manley p/n 660-42192
- Head Studs: ARP p/n 070-235-4702 (12-point)
- Spark Plug Specs: 14mm Thread, .750' (3/4') Reach, Gasket Seat
- Valve Angle: 26° and 4° Intake, 17° and 4° Exhaust
- Angle Milling: .0066' per cc
- Flat Milling: .0050' per cc
- Pushrod Slots: Standard
- Pushrods: Check pushrod clearance with head installed on the engine block before final assembly
- Stud Girdle: Standard, Brodix p/n 158-1230
- Rocker Arms: Standard
- Lifters: Standard
- Pistons: Standard
- Exhaust Pattern: Raised .600'
- Valve Centerline: Standard
- Spring Pockets: May not be cut any larger or deeper than 1.625'
- Accessory Bolt Holes are Drilled
- Recommended Intake Manifold: Brodix HV 2000 (p/n 158-HV2000) / HV 2001 (p/n 158-HV2001)
Accurate Airflow for Heavy BBC Builds
BRODIX BB-2 Plus Series 26-degree cylinder heads are engineered for heavy vehicles and smaller big block Chevy combinations in the 427-509 cu in range, delivering strong, repeatable airflow with a 312 cc intake port and 119 cc combustion chambers shaped for methanol or gasoline to help resist detonation. The 100% CNC-ported design is developed on the flow bench and at the track for consistent out-of-the-box performance, while standard-parts compatibility helps you retain common pistons, intake manifolds, and rocker arms. Raised .600 in. exhaust ports and a raised valve cover rail support improved flow and sealing for serious street/strip and bracket-style builds.
Part TypeTop End Kit
Product LineBrodix Big Block Chevy BB-2 Plus Series Aluminum Cylinder Heads
BrandBRODIX
Package Height21.5
Package Width23.0
Package Length24.5
Weight147.0 PG
Intake Manifold Model (Descriptive)Brodix
Intake Manifold IncludedYes
Retainers IncludedYes
Guideplates IncludedYes
Pushrods IncludedNo
Oiling StyleThrough pushrod
Cylinder Head Bolts IncludedYes
Valve Seats MachinedYes
Heat CrossoverNo
Number Of Springs Per ValveDual
Exhaust Port ShapeRound
Damper Spring IncludedYes
Valve Stem Seals IncludedYes
Intake Valve Diameter2.25 in (57.15 mm)
Valve Guide MaterialPhosphorous bronze
Outside Diameter Of Outer Spring1.645 in (41.8 mm)
Camshaft IncludedNo
Carburetor FlangeSquare bore
Steam Holes DrilledNo
Rocker Arm Studs IncludedYes
Retainer MaterialTitanium
Cnc-Machined Combustion ChamberNo
Lifters IncludedNo
Exhaust Valve Diameter1.88 in (47.752 mm)
Part CategoryPerformance Parts
Cylinder Head MaterialAluminum
Intake MaterialAluminum
Intake StyleSingle plane
Intake Port LocationStandard
Valve Cover MaterialCast aluminum
Rocker Arm Nut Thread Size (In.)7/16"-20
Intake FinishNatural
Exhaust Valves IncludedYes
Locks IncludedYes
Gaskets IncludedYes
Rocker Arms IncludedNo
Valve Covers IncludedYes
Rocker Arm Nuts IncludedNo
Cylinder Head FinishNatural
Intake Valve Angle26
Valve Seat MaterialDuctile iron
Valve Springs IncludedYes
Fuel Delivery StyleCarbureted
Valve Seat Machine Style5-angle
Valve Guides IncludedYes
Cnc-Machined Intake RunnerNo
Intake Valves IncludedYes
QuantitySold as a kit
Accessory Bolt Holes DrilledYes
Exhaust Port LocationRaised
Combustion Chamber Volume (Cc)119
Machined For O-RingNo
Timing Chain And Gears IncludedNo
Exhaust Valve Angle26
Cylinder Head StyleAssembled
Valve Cover Mounting StylePerimeter bolt
Intake Runner Volume (Cc)312
Cnc-Machined Exhaust RunnerNo
Vendor Part Number9992004-3
Package Qty1
Package TypeEA
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