Late Model Engines recently tested two nearly-identical 427 cubic-inch LS engines on the dyno.

One had cathedral-port heads, the other had rectangular-port heads, and the dyno shows a clear difference.

Looking to improve the performance of your valvetrain? Hamilton Cams has virtually everything you need for your Ford, GM, or Dodge diesel engines.

How much power is a set of downpipes, an X-pipe, and some tuning worth on a McLaren M868T out of a 570S?

Way more than you might think, as Excell Racing shows us with their XR700+ package.

New from MAHLE - the Mazda MZR PowerPak and PowerPak+ Piston Kits. These kits are built to handle the extreme load of today’s highly boosted direct injected engines. Check them out here!

In a new, engine-only competition, the Masters of Motors will recognize the hard work and artistry that goes into engines at both SEMA and PRI.

Seven classes and one overall winner will be crowned at each show.

New from Holley - the Sniper Stealth 4500 EFI Systems. These systems are specifically designed to upgrade drag race and high-performance street vehicles to EFI. Check them out here!

TCI Engineering built a pair of very similar small-block Chevrolets - a Gen-I and a Gen-IV - for their project cars.

Being so similar, it's a great chance to pit old versus new in a small-block showdown.