There are several ways to go with the style of camshaft you choose for your engine. This has a lot to do with what you want from your engine. What power and longevity do you want and desire? The problem with the flat-tappets has been discussed several times on here and we know that the more agressive they get the more likely they are to go out. I can not take the chance of them going out on the dyno or 3000 miles down the road on the customer. It does not matter if it is a hydraulic or a flat tappet camshaft they both have issues. If you run a small duration and small lift flat tappet camshaft you will have better luck with it living but will not have much power. Most of my customers want the best bang for the buck without any issues and this is why we use the hydraulic rollers in about every street engine we build. In the last three years that has amounted to about 150 FE hydraulic roller camshafts installed or sold to customers with about zero problems compared to the flat tappet camshaft losing a lobe on the dyno or down the road and the whole engine has to come apart again and be cleaned and rebuilt. We also break the camshafts in with low spring pressure and addititve and still have them go flat. If I have a customer that wants to use one I tell them I will not be responsible for it going down on the dyno or in the car after they install it. This will only get worse because of all of the zink being taken out of the
oil and they are even taking it out of the Rotella-T now. But what do I know, I find out I know less and less every day. I talk to a lot of people smarter than me every day but the funny thing is they called me, I didn't call them. Good luck, Keith