The IA 2 block is actually not aluminum and it's no longer made by Indian Adventures either. The IA name for the block was acquired by All Pontiac who is making the improved IA 2 version. It's a special iron alloy (sorry I forgot the specifics here). Spotts was one of about five Pontiac engine builders chosen to perform a build-up of five intial production blocks in order to provide feedback to All Pontiac. The AP guys are long time Pontiac racers that jumped in to make sure a block was available to all. It's a great success from everything I've read even though it's their first venture. Kaufman Racing Equipment is scheduled to release a similar block later this year and as mentioned earlier, Butler Performance will be releasing an Al block. The AP and KRE blocks are/will be going for just under $3k. The Al block will command substantially more of course.
