jet i have break in miles on it and i thought it was just the H&S rockers as i heard the were a bit noisy but when i went to prime it could not get oil out of two stems no matter what....tore the top end down and found the lifters collapsed (edelbrock). went up and grabbed the set Mr. P-body recommended as he said there has been a lot of problems with some of the other manufactures in a previous post. so much quieter now....have base set at 8 deg, 35 all in by 2800rpm oil when warm at idle is pegged at 30 and at cruise between 60 and 80. Temp never topped 175 even during a long idle at the gas station. dumped the secondaries from a 15 roll and lit them up jumped sideways hunched down and gripped, then barked second too boot.....WOW!!! at 60 MPH i am at 2000RPM with the 2:56 gear....may just stick with it.