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Trick Flow® 51400004 Twisted Wedge Street Heads 170cc, Assembled
Trick Flow? 51400004 Twisted Wedge Street Heads 170cc, Assembled

Regular Price: $1,249.95

Product Code: TRF-51400004

Description Technical Information
Trick Flow's patented Twisted Wedge Street series  performance aluminum cylinder heads feature Trick Flow's revolutionary "twisted wedge" combustion chambers to build more mid-range and top-end power without sacrificing bottom-end torque.

Here's how it works:  Trick Flow engineers rotated the valves and moved them over the center of the cylinder bores.  This optimizes the valve angles and the combustion chamber shape to dramatically boost airflow and allow for more complete combustion of the air/fuel charge.  And unlike other brands, Trick Flow Twisted Wedge heads are the only aftermarket heads that can run 2.020"/1.600" valves with stock, unmodified pistons and performance camshafts up to .550" lift. 

The Twisted Wedge Street series heads are built for heavy-duty use, too.  They have .560" thick combustion chamber walls and fire decks for added strength without a loss of cooling capacity, plus additional support risers in the water jackets for increased head gasket integrity. 

The Twisted Wedge Street heads are designed as a performance replacement for stock Ford heads and are 50-state emissions-legal on 1996 and earlier 289,302,and 351W Fords (CARB E.O. number D-369-1).  The Twisted Wedge Street CNC heads combine the proven power-building features of the Street heads with five-axis CNC-porting to give small block Fords an even bigger performance boost.

All Twisted Wedge Street series heads work with most OEM and aftermarket intake and exhaust manifolds/headers.  The heads come fully assembled and ready-to-install right out of the box with stainless steel valves (intakes are backcut for improved flow), valve springs, locks, retainers, ARP rocker studs, and guideplates.  Bare cylinder head castings are also available.

What is a Twisted Wedge Head?
Compare a stock combustion chamber (left) with the patented  Twisted Wedge
® combustion chambers found in Trick Flow Twisted Wedge cylinder heads (right).  The valve angles are rotated to unshroud the valves, and the spark plug has been moved closer to the center of the cylinder.  This increases airflow and allows more complete combustion.

  • Combustion Chamber Volume: 61cc
  • Intake Runner Volume: 170cc
  • Exhaust Runner Volume: 66cc
  • Intake Port Location: Standard
  • Exhaust Port Shape: Square
  • Exhaust Port Location: Standard
  • Intake Valve Diameter (in): 2.020 in.
  • Exhaust Valve Diameter (in): 1.600 in.
  • Valve Springs Included: Yes
  • Maximum Valve Lift (in): 0.600 in.
  • Outside Diameter of Outer Spring (in): 1.460 in.

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