Why the fuss over aluminum heads if no one is planning on running them or thinks they are an advantage? I see they removed them from the 1968 Race Hemi, but are still on the 1964 Race Hemi and the Street Hemi's. They've been on the 1964 RH engine blueprint list for several years. The old Ross Foundry dual plug head is on the 1964 blueprint list, but need to plug one sparkplug hole.