First off those are Isky rockers...... Correction, after a second look those don't appear to have the wide Isky pad but they have the reinforcing rib... Certainly not Crane, possible a Isky with small pad or possibly a max wedge/Marine/300J rocker... Second if those are 915 heads someone milled the rocker stands off them & added 59-63 style pedestals... Those pedestals were used on Max wedges, 300J's & early Marine applications... Typically you always run at least one shim between the rocker & the pedestal but often the rockers need a quick touch up on the lathe to reduce the shoulder on the pedestal side so there is proper clearance.... I usually cut .060 off the long shoulder of every rocker which allows room for about .025-.035 shim between the rocker & pedestal... That way the shims side on one another reducing wear on the rocker & pedestal... With those early style pedestals if the guy was good he may have corrected the sweep as well... But if he didn't correct the side to side contact patch I doubt he corrected the sweep.... Interesting to know why the pedestal change...
How about a couple better pictures showing valve tip alignment & one where the pushrod down into the head area isn't so dark....
If you go to this link you'll see Isky rockers with the hardened wide wear pad that haven't had the long side machined so the alignment is terrible...
http://s68.photobucket.com/user/AntiPirate_ARRGH/media/082420121563.jpg.htmlI & many others consider a properly set up set of Isky's the best street rockers for applications running less than 600 lift... They've been pushed allot further than that... I'd run those long before most of the fancy roller rockers out there... No parts to fail & cause other more serious damage...
