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Project X Assembled Aluminum Cylinder Heads for Small Block Chevy (185cc)
InfoVehicle Info Needed
PROMAXX PERFORMANCEPART NUMBER: 723-91898S

Project X Assembled Aluminum Cylinder Heads for Small Block Chevy (185cc)

$2,24571
ShippingShips on 09/21/2026
Lowest PriceLowest Price Guarantee

185cc Intake Runner
    Project X Aluminum Cylinder Heads
  • Small Block Chevy
  • Intake Runner: 185cc
  • Spark Plug: Straight
  • Valves: 2.02 in. Int./1.60 in. Exh.
  • Valve Angle: 23°
  • Combustion Chamber: 64cc
  • Valve Springs: 230 lbs. @ 1.900 in.
  • Set of 2
Part TypeCylinder Head
BrandPROMAXX PERFORMANCE
Package Height8.0
Package Width12.0
Package Length21.0
Weight54.0 PG
Retainers IncludedYes
Guideplates IncludedYes
Oiling StyleThrough pushrod
Valve Seats MachinedYes
Heat CrossoverNo
Spark Plug StyleStraight
Guideplate Pushrod Size5/16 in.
Cylinder Head TypeChevy Small Block
Valve Stem Seals IncludedYes
Intake Valve Diameter2.02 in (51.308 mm)
Valve Guide MaterialManganese bronze
Steam Holes DrilledNo
Rocker Arm Studs IncludedYes
Retainer MaterialSteel
Cnc-Machined Combustion ChamberNo
Exhaust Valve Diameter1.6 in (40.6 mm)
Part CategoryPerformance Parts
Cylinder Head MaterialAluminum
Intake Port LocationStandard
Rocker Arm Nut Thread Size (In.)3/8"-24
Exhaust Valves IncludedYes
Locks IncludedYes
Engine Make/SizeChevy Small Block
Lock Style7 degree
Rocker Arms IncludedNo
Cylinder Head FinishNatural
Intake Valve Angle23
Maximum Valve Lift0.8 in (20.32 mm)
Valve Seat MaterialSteel
FinishNatural
Valve Springs IncludedYes
UsageStreet/Strip
Valve Seat Machine Style5-angle
Valve Guides IncludedYes
Cnc-Machined Intake RunnerNo
Intake Valves IncludedYes
Combustion Chamber StyleHeart
QuantitySold as a set of 2
MaterialAluminum
Accessory Bolt Holes DrilledYes
Exhaust Runner Volume (Cc)66
Exhaust Port LocationStandard
Combustion Chamber Volume (Cc)64
Machined For O-RingNo
Exhaust Valve Angle23
Cylinder Head StyleAssembled
Valve Stem Diameter11/32 in.
Valve Cover Mounting StylePerimeter bolt
Valve Stem Seal StylePositive stop
Intake Runner Volume (Cc)185
Cnc-Machined Exhaust RunnerNo
Vendor Part Number91898S
Package Qty1
Package TypeEA
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