Lifter Technology Selection

Roller vs. Flat tappet on a street perf car is almost a wash either way. If you're already getting a modern high- performance camshaft you really won't be giving up much sticking with a FT in your 340. I am using a hydraulic roller cam in my build but that's only because I have a 5.9 Magnum shortblock which came with roller lifters from the factory. There is less internal friction but that mainly just helps MPG at lower RPMs and allows you to run oil without zinc in it. Converting an older engine to run roller cam can be close to $1000 because the lifters are much more expensive and you also have to be wary of the shorter lifter bosses on the non-roller engines which can cause oil pressure issues from the taller roller lifter body uncovering its oil feed.