440 source

We are running the eddy heads right out of the box, they need nothing, just check the open and seat pressure of the springs to make sure they will work with your cam. Cleaning up the ports polish them etc can be done if your looking for every last ounce of HP , maybe 15 hp there, but the cost and time to remove all the valvetrain isnt worth it to me at this time. My TTI headers were $671.00 bare, then spent $75 here at local powder coater for the high heat thermal coating in flat black.