24" to center of the front center line of the crankshaft. Bill, since you are running without the bumper/valance, be sure to cut off the fender at the scribbed line. That is actually part of the valance. If you are ambitious, sand the bottom of the header a bit, it is to thick. The 1:1 57's, the lower part of the headlight bucket was about a 1/2" lower than the header and the upper grill dipped down in that area. If sanded below the headlight at an angle so the grill right there tucks up behind the headlight area, it will look fine. Thinning this down 1/16" makes a HUGE difference in the front end. Also, if you go this route, be sure to trim the fender to match the bottom of the grill. Looking forward to seeing this done. Go for the BMF, start with a new blade, slow and easy. Yup, I been doing awhile and it still intimidates me! don't burnish down real good til after trimming. Makes getting the excess off tough.