The heads are ready for installation straight out of the box and are capable of producing well over 500 horsepower on a naturally aspirated engine as delivered. The heads feature intake and exhaust runners patterned after the famous Twisted Wedge CNC-ported heads. This allows them to flow like CNC-ported cylinder heads right out of the box—without the time and increased cost associated with CNC-porting. The result is near CNC-ported power and performance for about the same price as standard cast cylinder heads. The Fast As Cast version of the Twisted Wedge Street/Strip heads has other features that made the Twisted Wedge name synonymous with winning—high volume intake runners (190cc), 2.020"/1.600" stainless steel valves, high rate double valve springs, 10° machined steel super locks, 10° chromemoly steel retainers, bronze alloy valve guides, tungsten alloy valve guides, ARP 7/16" rocker studs, and guideplates. Twisted Wedge Street/Strip series heads work with most OEM and aftermarket intake and exhaust manifolds/headers. Bare cylinder head castings are also available. Contact Trick Flow Specialties at (330)630-1555 www.TrickFlow.com.