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-18X Series Cylinder Heads68cc Combustion Chambers Spread Exhaust Ports
- -18X Series Top End Kit
- 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.
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 HatCylinder 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: AngledFacts 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)
Part TypeTop End Kit
BrandBRODIX
Package Height17.0
Package Width23.5
Package Length24.0
Weight122.0 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
Spark Plug StyleAngled
Exhaust Port ShapeD-Port
Damper Spring IncludedNo
Valve Stem Seals IncludedYes
Intake Valve Diameter2.14 in (54.356 mm)
Valve Guide MaterialPhosphorous bronze
Outside Diameter Of Outer Spring1.55 in (39.4 mm)
Camshaft IncludedNo
Carburetor FlangeSquare bore
Steam Holes DrilledNo
Rocker Arm Studs IncludedYes
Retainer MaterialTitanium
Cnc-Machined Combustion ChamberNo
Lifters IncludedNo
Exhaust Valve Diameter1.6 in (40.64 mm)
Part CategoryPerformance Parts
Cylinder Head MaterialAluminum
Intake MaterialAluminum
Intake StyleSingle plane
Intake Port LocationRaised
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
Valve Seat MaterialDuctile iron
Valve Springs IncludedYes
Fuel Delivery StyleCarbureted
Valve Seat Machine Style3-angle
Valve Guides IncludedYes
Cnc-Machined Intake RunnerNo
Intake Valves IncludedYes
QuantitySold as a kit
Accessory Bolt Holes DrilledYes
Exhaust Port LocationSpread
Combustion Chamber Volume (Cc)68
Machined For O-RingNo
Timing Chain And Gears IncludedNo
Cylinder Head StyleAssembled
Valve Cover Mounting StylePerimeter bolt
Intake Runner Volume (Cc)245
Cnc-Machined Exhaust RunnerNo
Vendor Part Number9991002
Package Qty1
Package TypeEA
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