PRI 2019: ProMaxx Performance Cylinder Heads Span The Market

ProMaxx Performance Products has established itself in the marketplace as a manufacturer of affordable aluminum cylinder heads that perform better than their price might suggest. However, they aren’t content to have that reputation for just a few applications.

“We have a large assortment of heads, from full-blown CNC drag racing heads, down to heads for a 4.0 Jeep Wrangler,” says ProMaxx owner, Jason Collins. “Our heads are made of 356-T6 aluminum which we spec, with different guides and seats than other economical heads on the market. That’s really our claim to fame. You’re buying something at a lower price, but you aren’t sacrificing performance or quality.”

To that end, ProMaxx has two unique cylinder heads on display which are far from cookie-cutter. The first is an LS3 head, designed to work on small-bore engine combinations. “It has an LS3 runner that will fit on a 3.900-inch bore,” says Collins. “It’s got a .750-inch-thick deck, it has the raised valve cover rail, and is milled so you can run a shaft system, or it has a bolt-on billet rail to allow you to run a stock LS3 rocker setup.”

The ProMaxx small-bore LS3 head works with bore diameters as small as 3.900 inches while offering the larger LS3 intake port, to breathe better than any cathedral port.

In addition to the LS head, ProMaxx decided to dive into a world where an affordable aluminum cylinder head isn’t exactly commonplace — the diesel market. “Here at ProMaxx we do diesel performance stuff, too. We are the only people to have a 6.0-liter PowerStroke aluminum head,” Collins says of the DX-series cylinder heads

“We’ve taken that casting — which used to be cast-iron — and turned it into an aluminum head. We picked up flow — almost 30 cfm — in the as-cast version. And with the CNC version, it flows 240 cfm which is roughly 100cfm better than stock.” That kind of flow increase from a budget-minded cylinder head is almost unheard of. Add in the ability to order them already machined for O-rings, and you’re looking at some pretty impressive PowerStroke cylinder heads.

These DX-series aluminum heads for the 6.0-liter PowerStroke will come in as-cast and fully CNC-machined versions. Both offer significant increases in flow, and are available O-ringed right out of the box.

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About the author

Greg Acosta

Greg has spent fifteen years and counting in automotive publishing, with most of his work having a very technical focus. Always interested in how things work, he enjoys sharing his passion for automotive technology with the reader.
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