All right now for the ones that don't know I have a 72 demon I use to race then had the avenger built. I took the engine out of the demon and put in the avenger when the motor I built had pin hole in the cylinder. Now I wanted to get the demon going so I took the edel off the avenger. The avenger is running a 4" stroke and 4.04 bore with diamond pistons .015 in the hole for a 413 at 11 to 1 compression. Engine builders I'm I right? I took the edel off and the comp solid .585 lift out. I had Bryce put on my bullet springs and bolted on the air wolfs out of the box and installed the bullet .640 roller that I had ordered for the edelbrocks about a year ago. I used the same 1.6 hughes rocker arms. This is in a 2140 pound tube chassis car same converter and gears. I wont say were the power came from but I wasn't planning on that much of a gain.