I have a set of G1 Trick Flow Twisted Wedge heads for SBC. They are the first design that outflow all later designs. These have been fully race ported and outflow most other heads on the market. Dual springs for a .600 lift roller cam installed. They have receiver grooves cut for O-ringed blocks/copper head gaskets. These have about 10 miles on them since being rebuilt (new guides, springs, and seals) $1000 plus shipping

Flow Sheet
http://http://i1106.photobucket.com/.../FlowSheet.jpg