All Pro Aluminum Cylinder Heads has earned a reputation as a company that produces some of the best cylinder heads in the world for high-horsepower applications. If you’re trying to make anywhere from 2,500-4,000 horsepower with an LS-based engine, All Pro’s 12-5 heads are what you need to get the job done.

The 12-5 cylinder heads are perfect for engines that are turning a ton of RPM and will see excessive amounts of boost. The heads are very thick in all the right places to make sure they’re strong enough to deal with plenty of abuse. All Pro offers these heads with O-ring surfaces on the valve covers and intake face so you don’t have to worry about gaskets, there’s even an option for O-rings on the exhaust side too.

Bob Williams from All-Pro talks about some of the other great features the 12-5 cylinder heads offer to racers.

“This head has our custom profile exhaust ports that are moved in a different direction than standard LS heads. There’s a massive intake runner that’s also in a different position than your typical LS head too. It has our ultimate weight removal program that takes all the excess weight off the casting. We cut back in certain areas where we can without sacrificing any of the head’s strength. We have different combustion chamber sizes available from 65 cc all the way to 40 cc.”

The 12-5 cylinder head uses oil drains to help make between round maintenance easier. All Pro also offers different head bolt options based on your application and how much power you’re trying to make. You can learn more about these heads right here on All Pro’s website.