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2 Sticking with the Dart theme, we chose Dart’s top-end kit. These kits include fully assembled cylinder heads, stamped-steel valve covers, and intake manifold. Everything is matched to complement the cylinder heads, thereby taking the guess-work out of selecting various parts. The kit also includes intake gaskets, head gaskets, exhaust gaskets, spark plugs, and ARP head bolts. You can further customize your top-end kit by sticking with the iron heads or upgrading to one of two aluminum options: the Pro 1 aluminum cylinder heads for $263.78 or the CNC’d version for $1406.95. We opted for the $263 upgrade, which gives us all the advantages of aluminum without dropping four figures. Incidentally, our intake port volume is 180cc with 64cc combustion chamber volume. We wanted to maintain strong power across the rpm range for the street and these 180cc heads will provide that. Valve sizes are 2.02/1.60 (i/e).