Cool, thanks for the piece of mind, for a moment I thought that I might had messed up the thread and enlarged it, but it is the same thread, I suspected it(after I tapped all block bolt housings)... but should had been more carefull, I could had messed up if it was not the same size.I just forgot about it, got carried away with my new Craftsman Die n Tap set, and started having fun. Do not worry guys, I will make sure I reposition it in the right place, I cleaned the bolts too with a die,and the new bolts I bought, I will keep them for my performance rebuilt after smog(july), the car will be exempted from smog forever, so I will rebuilt the A15 to monstrous specs, and even in the event I use the L20(610's) later on, the A15 will go to the rallye ute. The bolts I got, I ordered for the A15, but after checking with my catalog, I got GX super bolts, I know that because my nismo catalog says GX stronger bolts have a number 13 stamped on the head of each bolt, which is the case with this set.No reason to use them now, this is a stock engine with a 32/36 Weber, but after a more compression build, they will come in handy. Dattodude, I will take pictures, so I will post them when developed, I will photograph both bolts for reference.