Well I picked up a new (for me) B18b block for parts, for very cheap because the head bolts are stripped. The block has shotpeened rods, brand new pr3 pistons, micropolished crank and all new bearings (plus all the basics from an engine build). I was going to swap all the internals onto my existing b18a block but after looking at the damage, could I repair the threads? I was thinking of helicoiling the block but im not sure if I can use helicoils on aluminum (I have used them on cast iron blocks before). Suggestions?