I'm returning to a long stalled project and in particular, the SV needs to get finished and stuffed in. On my last 392, and now on this engine, I've found that some valve spring choices don't work so well with the welded rockers - the retainer rubs the bushing area of some of the rockers. The stamped boat-style rockers fit fine. In particular, the Comp 924 BBC springs fit fine with either, the 930 springs don't. I'm not certain what springs Maulis put on the heads I'm using, but they don't clear. So the cleaned up welded rockers and ball/cup pushrods got put back in storage and I assembled some 9-stand boats, and then found.. 8 pushrods.. and I appear to be short the other 8. (Anyone need some 304 pushrods? Those are everywhere.. most of the blocks were recycled..) So I know the stock pushrods are 9.750" long. The factory calls out a 3/8 ball end. The replacement Melling MPR-201 pushrods show a slightly different story on the tip ends Likely that means the flat-ish spot is 5/32. Most pushrods run a 5/16 ball end (these days with a 210 deg ball, so the head of the ball is undercut to allow for more movement - like a trailer ball) I could order some of the factory pushrods - Jeff lists them, but darn it if I didn't read the Melling product details.. I exceed 300lbs. Probably by a fair margin on this one. My street motors usually exceed 350 open. So what's a good answer? The balls I measured were 3/8" last night (seems I have a couple of different manufactured pushrods in the 8 that I do have - some with an obvious ball end, some with just a tapered end) Thus far the only off-the-shelf 3/8 ball to 3/8 ball of 9.750" I've found is Comp 8692-1 (or 8692-16) which is a 7/16" pushrod tube - but it is Chromoly and .165" thick with 3/8 diameter tips. I know FE Fords used 3/8 ball ends on some, but they seem to be too short. Otherwise, lots of 5/16" stuff out there. Anyone have anything to add to this discussion? I need to drop the rockers on and check clearance in the lifter bores on whether I could go to a 7/16" diameter pushrod without scraping.