2 to 3 weeks turned out to be more than a month but me correct ARP head studs have finally arrived. Oh and Pos Laju charged me RM150 to air freight ten incorrect head studs back to the States :( Next time just use regular registered snail mail. Picture of the correct head stud.
The QG18DE requires 10 (there are 12 head bolts but the other 2 is non-load bearing) M10 (Metric 10mm) head studs. Price came up to 470+ smackers not including shipping and any tax for 10 head studs + same quantity washers and 12-point nuts. The reason the price is so reasonable is because I took the closest equivalent off the shelf head stud versus commencing the design and manufacture of custom head studs which would have cost me thousands of hard earned ringgit. Many thousands.
Per Greg (my supplier and boss of GSpec Performance) my head studs are same as the KA24DE. Here's another piccie. If you think you're going to make big power (>500hp) perhaps you can drill the block and try 11mm or larger diameter head studs. I'll stick to 10mm since I'm not.
Picture below shows the stock head bolt versus the ARP head stud assembled with washer and nut. The ARP head stud is about 12mm longer but I've confirmed with Toby there will not be any clearance issues.
As you can see from the picture above the thread length is the same compared with the incorrect head stud. Am working on ARP main bolts now which I'm hoping no praying will not be as problematic. Also need to order some fastener assembly lubricant.