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Dart Machinery, LTD. stands behind each product we manufacture 100%. Each component undergoes a detailed manufacturing process that involves the hundreds of calculated and precision steps to ensure the finest quality possible.
PRO1 23 LT1 LT4

PRO1 23° LT1/LT4

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Product Description

Designed for 1992-1997 LT1 and LT4 small block Chevy engines. 180cc, 200cc and 215cc intake runner sizes cover street performance to serious competition. Gen II reverse flow cooling system and intake manifold flange.

Dart PRO1 Platinum series heads for LT1/LT4 small blocks were developed with Dart’s exclusive wet flow technology. Their advanced features include 5-angle intake seats and back cut valves that provide shear points for the fuel to go into suspension as it enters the combustion chamber.

The spark plugs are located as close to the top and center of the combustion chambers as possible, shortening the distance that the flame front must travel and producing a more uniform pressure rise in the cylinder.

Assemblies include Stainless Steel valves, premium springs, locks, retainers, guide plates and seals.

Heads are sold individually.

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Material: RMR Cast Aluminum Alloy

Valve Angle: 23° (stock)

Intake Port Volume: 180/200/215cc

Intake Valve: 2.020”/2.050”

Exhaust Valve: 1.600”

Chamber Volume: 58cc

PRO1 23° 180cc – Aluminum (LT1/LT4 Heads)

58cc Combustion Chambers

11110010L – Bare Head

11111111L – 1.250” Single Springs for Hydraulic Flat Tappet Cam .510”

11111112L – 1.437” Dual Springs for Hydraulic Roller or Solid Flat Tappet Cam .620”


PRO1 23° 200cc – Aluminum (LT1/LT4 Heads)

58cc Combustion Chambers

11310010L – Bare Head

11311111L – 1.250” Single Springs for Hydraulic Flat Tappet Cam .510”

11311112L – 1.437” Dual Springs for Hydraulic Roller or Solid Flat Tappet Cam .620”

11311113L – 1.550” Dual Springs for Solid Roller Cam .660”


PRO1 23° 215cc – Aluminum (LT1/LT4 Heads)

58cc Combustion Chambers

11510020L – Bare Head

11511122L – 1.437” Dual Springs for Hydraulic Roller or Solid Flat Tappet Cam .620”

11511123L – 1.550” Dual Springs for Solid Roller Cam .660”

180 LT-1 Tech Sheet – H18

200 LT-1 Tech Sheet – H19

215 LT-1 Tech Sheet – H20

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