The Ford Barn

Terry, NJ · 06-30-2015, 10:48 AM

Mike, I hate to argue with so knowledgeble a guy as you are. But I have to disagree with your belief that you can't check for warping with a straight edge. If you check diagonally , corner to corner, it should show a concave "belly" one way and a convex belly the other. This should reveal any twist in the head. The question then becomes how much warp does it have to be to be functionally warped? .001? .010? As a student in Tool and Die class in Vo Tech school, I brought two flat heads into class one thinking I could get them cut down (LOL) Clever me! I told the instructor that I thought they were warped. The instructor, being the T & D maker that he was, wanted to be sure! So we took a straight edge and went through the drill (Checking corner to corner with a straight edge and a feeler gauge) and what do you know? They weren't warped! Another way would be to rock it on a surface plate, or stand it on four Jo-blocks. I agree that the head must be shimmed other wise you'll just reproduce that warp on the new surface.
Terry

06-30-2015, 10:48 AM	#8
Terry, NJ Senior Member Join Date: May 2010 Location: Bucks Co, Pa Posts: 3,749	Re: Checking Head Surface for Flat? Mike, I hate to argue with so knowledgeble a guy as you are. But I have to disagree with your belief that you can't check for warping with a straight edge. If you check diagonally , corner to corner, it should show a concave "belly" one way and a convex belly the other. This should reveal any twist in the head. The question then becomes how much warp does it have to be to be functionally warped? .001? .010? As a student in Tool and Die class in Vo Tech school, I brought two flat heads into class one thinking I could get them cut down (LOL) Clever me! I told the instructor that I thought they were warped. The instructor, being the T & D maker that he was, wanted to be sure! So we took a straight edge and went through the drill (Checking corner to corner with a straight edge and a feeler gauge) and what do you know? They weren't warped! Another way would be to rock it on a surface plate, or stand it on four Jo-blocks. I agree that the head must be shimmed other wise you'll just reproduce that warp on the new surface. Terry