Man I thought the stealths had 3/8's as I have a set of manley 2.14/1.81's & wanted to get a set of the improved larger port bare stealths. Thanks for the heads up & now I'll prob go w my orig plans of sideways enlarging the MP templates & doing my 452's. Just dont like the (added) expense of leveling/matching the recesses plus new guides and the extra weight and smaller ports (than the stealths) and...