Hi, I've been rebuilding my '57 392 hemi this summer and everything has been going really well (and slow) - so far. Last night when I was installing adjustable pushrods, stock 5/16" width, I noticed some exhaust rods being pretty badly offset going through the heads. And always offset towards the stands. They are not quite rubbing the head, but they are really close and might rub when engine is hot. I've read people usually grinding the holes bigger for 3/8" pushrods, but since these are stock width, I was not planning on doing that and was not expecting to see any issues either. I'm wondering what could be the cause of this. When I first rebuild the heads a while ago, the rocker shafts were filled with sludge so there were some oil circulation issues in the valve train. Would it be possible that exhaust rockers wore out more by rubbing with rocker stands because of lack of oil? Wouldn't think that swapping rockers between the left and right bank would make any difference, but will be testing that tonight. Looking at possible fixes I'm wondering if I could move the offset pushrods by shimming the exhaust rockers with chrome-moly shims. Anybody see any issues with using shims between the rockers and stands? At this point I don't want to start grinding the holes bigger, if there's a way to avoid that... Thanks!