Crazy thing about this big block rpm copy is Speedmaster doesn’t offer this head. They only offer the Victor copy which has caught lots of guys by surprise after they received them. Not sure why they didn’t catch the huge runner volume. Speedmaster being one of the biggest off shore head sellers was surprised when i questioned him on this. It’s like they forgot about a part number that would sell probably 8 times better than the Victor copy. Hopefully they offer it soon because I would grab a few set’s during the 40% off sale.