Man, that is some nice stuff. What would be the biggest bore for that block? Are you going to offer blocks with different bore spacing? Are all of your blocks water blocks or is there a solid block option? Rumor has it that the Indy solid block is stronger than their own water block. Does the same hold true for your blocks?
Sgcuda, there's a few interesting questions there. We are looking at a 4.900/5.000 bore space block, but it is number 4 in our current product development plan, so a little while off.
Mostly, builders try to stay under 4.530 although I am sure people have taken them further - just not much of a need to.
Solid vs Water blocks: Interestingly, the early KB blocks that ran top fuel were water jacketed with limited supporting material (wet sleeve). They had proven themselves at 6,000+ hp, so at really high cylinder pressures.
We have a minimum of .300 Aluminum around each sleeve which is already very thick. The main purpose of the solid blocks is not really strength, but to build heat in Alcohol applications.
That said we will be doing runs of solid blocks, and these will be sold as "Pro" blocks for finish machining by our Dealers.
I can't speak for the Indy Blocks, they're pretty good for their intended use. Our engine blocks are a precision-machined piece, with its design roots in powering top-fuel level power.
Here's a picture showing the head-fastener & clamping load comparison.
