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Dart SHP Special High Performance Cylinder Heads 128121 Head, SHP, Aluminum, Assembled , 58cc Chamber, 0.510 in. Max Lift, 175cc Intake Runner, Ford Small Block, Each

SKU: DRT128121

Cylinder Heads

Dart SHP Special High Performance Cylinder Heads 128121 Head, SHP, Aluminum, Assembled , 58cc Chamber, 0.510 in. Max Lift, 175cc Intake Runner, Ford Small Block, Each

SKU: DRT128121

Cylinder Heads
A$1,619.91
BACKORDER This item will be special ordered in for you. Contact us prior to purchase if you require an ETA.

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Description

Cylinder Head - SHP - Assembled - 2.020 in / 1.600 in Valves - 175 cc Intake - 58 cc Chamber - 1.250 in Springs - Angle Plug - Aluminum - Small Block Ford - Each


Data: v2 - Desc: v4.2 - Upd: 2026-11-07 19:42:35

Data: v4.2 - Upd: 2026-11-07 20:31:00

Features

Images are supplied by the manufacturer and may be generic. While all efforts are made to provide accurate pictures, there may be differences in the actual product, such as colour, quantity, version, or included components. Please carefully review the description and specifications for details on inclusions or any variations. Some items may be sold individually or in sets, and images may occasionally depict additional products or quantities not included in your purchase. For assistance or clarification, please contact customer support.

Specifications

Reference Information

Reference Data (Provide these details to our support team)
Brand Name/s Dart
StreetFX SKU drt128121
SFX Item ID 5090209
Accounting SKU drt-128121
Manufacturer SKU 128121
Manufacturer UPC 807501054286
Alternative References 128121, DRT-128121

Cylinder Head, SHP, Aluminum, Assembled , 58cc Chamber, 0.510 in. Max Lift, 175cc Intake Runner, Ford Small Block, Each

Dart SHP Special High Performance cylinder heads provide an affordable option for those who desire the weight savings of aluminum heads for a performance street engine. These units are manufactured from A356-T6 aluminum and are designed to work with most off-the-shelf components. SHP heads are available with your choice of 64cc or 72cc combustion chambers—and come in both 180cc and 200cc intake runner ports that are precision-cast to offer excellent flow and power without the need for CNC-machined porting. They feature optimized chambers for increased combustion efficiency, as well as multi-angle intake seats. The cylinder heads' radiused exhaust seats dramatically increase their performance, and the manganese bronze valve guides increase their life.

Product Attributes
BrandDart
Manufacturer's Part Number128121
Part TypeCylinder Heads
Product LineDart SHP Special High Performance Cylinder Heads
UPC807501054286
Combustion Chamber Volume (cc)58
Intake Runner Volume (cc)175cc
Exhaust Runner Volume (cc)70cc
Cylinder Head StyleAssembled
Cylinder Head MaterialCast aluminum
Camshaft StyleHydraulic flat tappet
Intake Port ShapeRectangular
Intake Valve Diameter (in.)2.020 in.
CNC-Machined Combustion ChamberNo
CNC-Machined Intake RunnerNo
CNC-Machined Exhaust RunnerNo
Combustion Chamber StyleHeart
Intake Port LocationStandard
Exhaust Port ShapeSquare
Exhaust Port LocationStandard
Intake Valves IncludedYes
Exhaust Valves IncludedYes
Exhaust Valve Diameter (in.)1.600 in.
Valve Springs IncludedYes
Maximum Valve Lift (in.)0.510 in.
Outside Diameter of Outer Spring (in.)1.250 in.
Damper Spring IncludedNo
Number of Springs Per ValveSingle
Retainers IncludedYes
Retainer MaterialSteel
Locks IncludedYes
Lock Style10 degree
Valve Stem Seals IncludedYes
Valve Stem Seal StylePositive stop
Rocker Arm Studs IncludedYes
Rocker Arm Nut Thread Size3/8 in.-24
Rocker Arms IncludedNo
Rocker Arm Nuts IncludedNo
Guideplates IncludedYes
Guideplate Pushrod Size5/16 in.
Valve Cover Mounting StylePerimeter bolt
Accessory Bolt Holes DrilledYes
Intake Valve Angle20
Exhaust Valve Angle20
Valve Guides IncludedYes
Valve Guide MaterialManganese bronze
Valve Seats MachinedYes
Valve Seat Machine Style4-angle intake/2-angle exhaust
Valve Seat MaterialPowdered metal
Cylinder Head ColorNatural
FinishNatural
Steam Holes DrilledNo
Oiling StyleThrough pushrod
Machined for O-RingNo
Heat CrossoverNo
RemanufacturedNo
QuantitySold individually.

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