I've used and recommended T&D rockers for years but I had an issue with them a little over a year ago. I have two sets of B1 individual shaft rockers. I used blue set and a brand new silver set. A good Friend broke a rocker in his wife's dragster and asked if he could borrow a pair till he could order a new set and some spares. Well after about 6 calls from my Friend calling for numbers, markings, and every other question and 6-8 months I finally got my rockers back. Shouldn't have really been that hard for a company to make up a set of 1.7 ratio rockers and some spares but they acted like they lost the blueprints. I only hope when I go to put my engine back together that they made them right. Kinda scary when you have a brand new set of 1100 dollar rockers on the line. They won't be loaned out again.