That set of twins has withstood the test of time, they were the second set ever made or a LB7, (Juice up in Alberta had the first set) and they were used to make the jigs for the first generation of LB7 twins by Nathan. Those twins have been around and used pretty hard. They are the set I used in the hill climb competition we use to due in Montana. Even pulling a 10,000 trailer up a 6.5% hill from a 4x4 boosted lanched start the EGT's never got over about 1450 degrees in a mile. Got that trailer seriouly moving too.:thumb: