[Jim Downard]

Thanks for the info guys. The motor was built by Indy Mustang Performance in Indianapolis. He said he did balance it and the actual balance weight he gave me was 28.2 oz. Don't know if that matters much or not. My old motor was a 351w bored 30 over and a very reputable local machine shot had it internally balanced. I loved how smooth that motor was. It's a '71 windsor so I'm keeping it. I am however getting a little nervous now as during the cam break-in process I felt noticable vibration between 1500-2000. I also wound it up between 4000-5000 on the way home the other night and felt a high rpm vibration that was concerning me. Now I'm thinking about pulling the motor and sending out the pistons, rods, crank, flywheel, and damper and having it rebalanced internally. It seems that lately there has been way too much incompetence in the world. The only way I feel comfortable anymore is to do it myself. Well, I could always put those rousch 200's on my old windsor. I'll bet it would run better than the old 2 bbl heads that are on it now. Then I'd feel comfortable again. Oh, by the way, I called the builder the other day and he said he never had a seal go out like that before. Of course, what else is he gonna say.

Don, what cam profile would you recommend for a 393 with cast iron rousch 200's, 10.5:1 compression, Edelbrock Performer RPM intake and Edelbrock 750 cfm carb. Mine's rather mild. Runs strong, but idles like a '75 LTD four door.

Jim Downard