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![BB-2 PLUS Series Cylinder Head for Big Block Chevy Engines, Rectangle Port [312 cc]](https://www.jegs.com/images/mini_750/100/158/158-2021012.jpg)
Vehicle Info NeededBRODIXPART NUMBER: 158-2021012
BB-2 PLUS Series Cylinder Head for Big Block Chevy Engines, Rectangle Port [312 cc]
$1,13535
Ships on Sep 23, 2026
Lowest Price GuaranteeBB-2 PLUS Series Cylinder Heads312cc Intake Port Volume 1.550'' Diameter Valve Springs - 550# Open, 240# Closed Spring Pressure
- BB-2 PLUS Series Cylinder Head
- Big Block Chevy
- Rectangle Port
- 312cc Intake Ports
- 119cc Combustion Chambers
- 2.250'' Intake / 1.880'' Exhaust Valves
- 1.550'' Dia. Springs - 240# Seat Pressure
- Steel Retainers
- Sold Individually
Cylinder 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: 1.550' Diameter - Open Pressure: 550 lbs.; Closed Pressure: 240 lbs.; Installed Height: 1.950'; Max Lift: .700'
- Spring Retainers: 1.550' 10° Steel
- 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)
Emissions Note:
This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.
CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART
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 TypeCylinder Head
Product LineBrodix Big Block Chevy BB-2 Plus Series Aluminum Cylinder Heads
BrandBRODIX
Package Height7.75
Package Width10.0
Package Length23.25
Weight47.9 PG
Part CategoryPerformance Parts
Cylinder Head MaterialAluminum
Intake Port LocationStandard
Rocker Arm Nut Thread Size (In.)7/16"-20
Exhaust Valves IncludedYes
Locks IncludedYes
Retainers IncludedYes
Lock Style10 degree
Guideplates IncludedYes
Rocker Arms IncludedNo
Oiling StyleThrough pushrod
Rocker Arm Nuts IncludedNo
Cylinder Head FinishNatural
Valve Seats MachinedYes
Intake Valve Angle26
Maximum Valve Lift0.7 in (17.78 mm)
Valve Seat MaterialDuctile iron
Heat CrossoverNo
Number Of Springs Per ValveDual
Valve Springs IncludedYes
Valve Seat Machine Style5-angle
Damper Spring IncludedYes
Valve Guides IncludedYes
Cnc-Machined Intake RunnerNo
Intake Valves IncludedYes
QuantitySold individually
Valve Stem Seals IncludedYes
Intake Valve Diameter2.25 in (57.15 mm)
Accessory Bolt Holes DrilledYes
Exhaust Port LocationRaised
Valve Guide MaterialPhosphorous bronze
Outside Diameter Of Outer Spring1.55 in (39.4 mm)
Combustion Chamber Volume (Cc)119
Machined For O-RingNo
Exhaust Valve Angle26
Steam Holes DrilledNo
Rocker Arm Studs IncludedYes
Cylinder Head StyleAssembled
Part FitmentSemi Universal
Valve Cover Mounting StylePerimeter bolt
Retainer MaterialSteel
Intake Runner Volume (Cc)312
Cnc-Machined Exhaust RunnerNo
Cnc-Machined Combustion ChamberNo
Exhaust Valve Diameter1.88 in (47.752 mm)
Vendor Part Number2021012
Package Qty1
Package TypeEA
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