I think pre 87 serpentine belt cranks are the same length in front as V-belt cranks. Would have to check to be sure, but I know the balancer is different between the pre 87 and 4.0L. The belt on the 4.0L is at least 1/4" closer to the block, due mainly to the balancer being "backwards" in comparison to the earlier 258 serp setup. There is a 1/4" flat space IN FRONT of the belt teeth on the 4.0L, BEHIND the belt teeth (between timing cover and belt) on the early 258. The 87-89 258 uses the same belt setup and balancer as the 4.0L, and shorter crank snout. On July 7, 2005 andrew hay wrote: > there are pluses and minuses for any of the different 258 cranks. a > serp belt one [used as early as '82] is easiest; v-belt snouts are > about 3/8" [~10mm] longer and need trimming or a spacer. a '72-'80 > 12-weight crank is supposed to be smoother, especially for low-rpm > running, and stronger - but nobody on the strokers group has reported > any problems with the '81-up 4-weight crank. > > 258 main caps are beefier than the 4.0's, but you'd need to align bore > the block to use them and for a moderate stroker not really necessary. > > '96-up 4.0s have a main girdle which mounts on studs sticking out from > the main bolts. it's a drop-in for any 4.0 but you need a few washers > under the girdle to clear a 258 crank. > ________________________________________________________________________ > Andrew Hay the genius nature > internet rambler is to see what all have seen > > adh@xxxxxxxxxxxxxxxxx and think what none thought ============================================================= Posted by wixList Archiver -- http://www.amxfiles.com/wixlist