Dart 220 heads are ideal for serious street performance, e.t. bracket racing, and restricted oval track classes that require stock type castings. The intake ports are as wide as possible with stock type rocker arms and the exhaust ports as high as possible with standard headers. The chambers are opened up to unshroud the valves and maximize breathing. The result is outstanding power from a stock type head!

Dart Raised Runner heads work great on large displacement and high rpm engines. The intake ports are raised .400" to produce a more direct path to the valves and there is plenty of material in the roofs, floors, and walls to allow extensive porting. The higher port location requires a corresponding intake manifold (available from Dart; see price sheet).

Small Block Bare/Complete Assemblies Here

Material: High-density 355 T6 aluminum
Valve Angle: 23° (same as production)
Intake Ports: 220 220cc as cast Raised Runner 215cc as cast, 237cc with CNC full porting
Combustion Chambers: 220 64cc as cast Raised Runner 64cc as cast, 67cc with CNC full porting
Intake Valves: 220 2.055", 2.080", 2.100"; + .100" long Raised Runner 2.080", 2.100", 2.125"; + .200" long
Exhaust Valves: 220 1.600", 1.625"; + .100" long Raised Runner 1.600", 1.625" + .200" long
Guide spacing: 220 1.890" (moved .030" from production) Raised Runner 1.910" with "60/40" layout (intake moved .040" toward bore centerline and exhaust moved .060" toward wall to minimize shrouding and allow use of larger intake valve)
Valve Guides: Replaceable magnesium bronze (for high compression), phosphorous bronze (for 9:1 compression); 11/32" I.D.
Rocker Stud Location: Same as production (uses standard studs and production & #150;type rockers; no machining required for Jesel shaft rockers) Raised Runner "60/40" layout (.225" offset stud rocker or .450" offset shaft rocker recommended) Raised Runner intake ports are .400" higher than stock to improve flow. Pushrod clearance in not machined to allow maximum widening of intake ports. Intake guides are moved .040" toward cylinder bore centerline to minimize shrouding and allow use of larger valves. High swirl combustion chambers fit most standard pistons. Interlocking ductile iron valve seats are compatible with stainless and titanium valves. Angled spark plug holes are drilled in stock location for header clearance. Gasketed 3/4" reach spark plugs offer the widest selection of heat ranges. CNC machined chambers are available for 4.030" or 4.155" bore size. Optional spread exhaust ports allow use of larger primary tubes without header plates. Raised exhaust port roof improves flow while retaining standard port location and bolt pattern. Water passages between exhaust ports improve cooling and prevent "hot spots" that can cause head gasket failure. Integral bosses can be drilled for fuel injection down nozzles.

Small Block Bare/Complete Assemblies Here