It's been all the talk on internet forums, club meeting hangouts, and in enthusiast garages across the nation—the loss of zinc and other protective "barrier" chemicals in modern oil damaging ...

When Chet Herbert introduced roller tappet camshafts to racing in 1950, he established an upper echelon of performance hardware that continues to carry that hard-core mystique. The roller tappet ...

Face it: Real engines have roller cams (and we're not talking about factory hydraulic rollers). If you think your flat-tappet mill can make some ponies, then you're in for a real surprise. Cost is ...