The approved aftermarket block program is moving along (this is an aluminum version to sort out the machining operations prior to mass market) Iron versions will be cast soon. Both aluminum and cast iron will be the strongest cast blocks on the market from any manufacturer, because of material, casting process and other advancements in design, in the pics material will be added to achieve the proper lifter phasing with the canted heads.
The Iron block is approved for NHRA, the aluminum and iron is approved for NMCA prostock