[Keithc8]

We have already gotten the Blue Thunder MR and HR heads in. I have already done a CNC program on both heads. They use the same chamber and exhaust port but different intake port. Both heads are set up to use a High Riser rocker stand so if you have Medium Riser stands you will have to find some HR stand or buy them from Blue Thunder. We see no improvement on the exhaust over the Edelbrock and the High Riser intake is better but rquires a special intake. The Medium Riser head is nice but flows no more than our Edelbrock stuff. If you put the port in the stock location with the stock height and stock length valve with the stock valve angle you are not going to be able to do anything special with the head. The heads are good quality and have King serts installed from Blue Thunder. I think everybody is looking for the trick of the week. If you have agood cylinder heads guy that understands the needs of that engine and the camshaft that is being run you can get good power with either head. The truth be none the Shelby head is the lightest and thinest head of the bunch and limits the amount of port work that can be done but that said you can make 650HP with any of the three on pump gas if you know what you are doing. On race engines you can make over 850HP with the Edelbrock or Blue Thunder. It boils down to how much do you want to spend on a set of heads and a engine. The Blue Thunder has 2 chambers design available, the standard 427 machined chamber and one similiar to a Yates style head that requires quite a bit of work to unshroud the valves and ends up with a large chamber volume of about 85CC. We can get any of the heads that you want and probably keep more FE stuff in stock than anybody. Good Luck, Keith Craft