My Brother was up at Kent's this weekend getting some stuff and was getting an update on the blocks. Kent said he got the block approved by NHRA for stock and SS racing. My brother has two blocks on order: An aluminum XR2 for P7 heads. It has been cast and machined and is getting sleeves in right now. And the second is an iron XR1 48 degree. It is to be cast with the next pour at the end of November 2015. Machining to be done in December 2015. I will let everyone know how they turn out.
Dave


My 1974 2WD shortbed Chevy Truck build thread:

http://67-72chevytrucks.com/vboard/showthread.php?t=525098