He was either way he just warned me about tuning and getting it correct or you can create your own issues. Some refused to build at all with them. My big issue is don't want to have to rebalance everything and have a crank that I could never use again. Read a few here and horror stories on confusion what harmonic balancer do I use now torque converter and plate and such. Just trying to take all the information in and weed out the BS and the real facts. HP is great but not at the sake of reliability is also the goal here.