Modern internal combustion engines are under a lot of stress during normal operation. In particular, there's a lot of tension between the cylinder head and the engine block, especially in diesel ...

Aftermarket head studs are vital for high-performance engines with high compression or turbochargers, both of which experience extremely high internal cylinder pressures. ARP studs are a popular ...

A certain amount of leeway is built into almost every factory part. Take Project Rust Bucket's turbocharger for example, which is now producing 37 pounds of boost instead of less than 20. Or the ...

Should I retorque head bolts? Yep, that seems to be a big question on the web and it gets, like most questions on the internet, a variety of answers. In short, at least here in 2020, the answer is no, ...

After purchasing a brand-spanking-new Harley, it's time to start doing what we do best and hot rod that sucker. Most of our Harley tech stories up to this point have concentrated on bolt-on parts for ...