we start with a dart shp block completely machine block we balance a 4340 rotating assembly premium forged piston 12.5.1 comp. rhs cast iron cly. heads severe duty valves custom ground solid roller camshaft 4/7 swap .080 push rods lifetime warranty roller rockers melling hvcp oil pump premium oil pan, billet double roller timing chain, hd timing cover sfi balancer high rise intake valve covers arp head bolts arp 2000 rod bolts acl race bearings any questions please call Bobb jacobs everything is machined on state of art eguipment!