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d962r and I have been trying to figure out exactly what will work and what wont. It sounds like the strongest rods used in any 4a platform from Toyota are definately the early USDM 4agze, with the ae111's appearing to be smaller, though I haven't done a lot of measuring - definately bigger than the NA, and extremly robust compared to the blacktop 20v. I know that Bill Sherwood has done some testing and has on occasion had no problem revving a stock-ish bottom end to 9k, but I wouldn't do it for any kind of enduro or severe use unless you want to risk having a rod come through the firewall and poke ya in the arse. Vince and I were talking about using a formula atlantic crank and rods so it would be stable and with the right pistons be able to maintain 10 or 11k so we can get the most response and boost out of the 4a that we can. I know our initial plans have changed a lot, but I spent a good bit of time trying to plan out a 500hp+ 4a, which is where the high revs would really help with trying to keep the turbo spun up - 30+# boost takes a big turbo, and will have piss poor drivability, but will be oh so fun when it takes off. Now just need to figure out how to keep the head from walking, and the cylinders from distorting. I'm tempted just to try to source a 503e and forget about the 4a. Regardless, my plans for my '86 are currently a stock gze bottom end with the shotpeened and balanced rods, and a full dynamic balancing but I'm only gonna run 8k max with an 8.5:1 bottom end.
As to the original question, I think that paradise racing should have no problem getting you carillo rods if you want to spend the money. TRD also had some (and I think those were made by carillo). You can custom order something from Scat Performance, including cranks, but it will cost ya. I would just give the stock rods some love and go from there. If you're shooting for those big numbers, you're probably going to pop a motor anyway, so you'll get a chance to find out what is the weakest link and work from there.
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