Dart 16776010 Aluminum BB Chevy 340 Race Series Cylinder Heads Bare (1 head)

Dart Race Series Big Block Heads deliver superior performance without the hassles of welding and modifying stock castings. Dart applied proven Pro Stock technology to produce big block heads that out perform the competition-yet Dart heads can be used with most off the shelf pistons, manifolds, headers, and valve train components. Dart Race Series Big Block Heads feature premium alloy cast from virgin 355-T61 aerospace alloy for superior strength and integrity, 24 degree (rolled two degrees from stock) valve angles to reduce chamber volume and improve flow, heart shaped 119cc or 139cc combustion chambers improve efficiency and increase power, interlocking ductile iron valve seats are compatible with stainless steel and titanium valves, exhaust ports raised .300" to improve airflow over short side radius, raised ports fit most standard headers, raised head bolt bosses eliminate exhaust flow restriction found in stock heads (require 1" longer head bolts included with Dart head bolt and head stud kits), spark plug holes are machined for gasketed 3/4" reach, 5/8" hex plugs, available without water jacket for alcohol applications, rocker studs are relocated for revised valve angles, use standard big block rocker arms, studs and guide plates, many custom options are available.