got this of the trick site... The heads are machined for 2.02" intake/1.60" exhaust valves to build top-end power without sacrificing bottom-end torque. They don’t require flycut pistons for use with cams up to the specifications listed—no other 2.02"-valved head for small block Ford offers these features!
The Twisted Wedge heads are built for heavy-duty use, too. They have .560" thick combustion chamber walls and fire deck for strength without compromising cooling capacity. Additional support risers are strategically located in the water jacket for additional rigidity and head gasket integrity.
Twisted Wedge heads have stock height intake and exhaust ports that allow the use of most OEM and aftermarket intake and exhaust manifolds. Fully assembled heads come with stainless steel valves (intakes are back-cut for improved flow), valve springs, locks, retainers, rocker studs, and guideplates. The heads are also available as bare castings. Heads are sold in pairs. Heads are patented.
that means i can use stock one right?