This Dart 126221 SHP Series Aluminum Cylinder Head is a redesigned and improved version of the original SHP series 127221 head, and it delivers power increases at a budget-friendly price. Enhanced features include raised ports, dense aluminum alloy construction using proprietary permanent molds resulting in smooth as-cast intake runners, exhaust runners, and combustion chamber.

Dart 126221 Features:

• Fully assembled with valve springs, steel 7° retainers, Viton valve seals, hardened valve spring cups, 3/8 in. rocker arm studs, and adjustable guide plates included
• Valve springs with an outside diameter of 1.250 in. and rated at 120 lbs. @ 1.700 in. for use with a hydraulic flat tappet camshaft w/.510 in. max lift
• Revised, exceptionally smooth as-cast 180cc intake runner design to provide optimum power gains
• Exceptionally smooth 72cc combustion chamber
• Manley stainless steel 2.02 in. intake and 1.60 in. exhaust valves
• Powdered metal valve seats with multi-angle valve job
• Magnesium-bronze valve guides with .530 in. Viton valve seals
• Manufactured using an exclusive process using permanent molds
• Straight spark plug angle uses a 14mm .750 in. reach spark plug such as Autolite AR3934 (sold separately) or equivalent
• Sold individually

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

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