I'm wondering how these will fair on a 340 .030 over without any port work and just a bolt and go. The runners look bigger and better than stock X heads and the bowls look nice and clean also.
Since these are close chamber heads...you will need to see where your pistons are ...above or below the deck and then adjust accordingly with head gasket to make it work...
These heads as shown are CNC...ported...probably clean the stock x heads clock easy......
