SEMA 2019: Mast Motorsports Releases Heads For The Honda K-Series

The manufacturer of the world’s first aftermarket cylinder heads for Honda’s, Mast Motorsports, offers a hungry client base a unique, versatile, and cost-effective product. Thanks to 3D-printing, these innovators can offer the most discerning customers an array of impressive options for a very reasonable price.

Each of Mast’s heads come with copper-infiltrated valve seats — arguably the best on the market. The valve guides, too, are “the finest we’ve ever been able to source, and each valve guide is hone-fitted for the valve stem that’s going in it,” proclaims Larry Widmer of Endyne, who collaborated with Mast Motorsports to design the new cylinder head.

Aside from the savings that come with avoiding hard tooling, there was no expense spared with these heads.

Each asset is a demonstration of Mast’s emphasis on efficiency. The “OE” style ports improve airflow by 30-percent. Since these are slightly smaller than the factory ports, airspeed is faster — providing a grunty midrange that drivers of 2.0-liter engines never imagined. These are only one of the library of port styles available for the K-series — and some of Mast’s ports can even flow 450cfm — remarkable for such a small motor.

Because these cores are printed, they’re easily modified. If a client decides to run down the forced-induction route and strap a turbocharger to their K-series head, they can specify blisters, and thus four studs around each exhaust port, so that threads never wander into a water-filled channel.

What else? Because they provide additional air bleeds on the exhaust side, the head clears air rapidly — a must, since an air bubble keeps a K-series head from running right. Additionally, because the casting is better than the OE heads, the valve seats don’t wander around. The list goes on.

Although the deck is thicker than the OE head, Mast prints the water jacket cores to offer cooling in areas nobody had ever thought of before. Utilizing that technology has a few other assets: it can provide a rough chamber to guys who CNC their own heads. “By printing these heads, we have luxuries that we’ve never had before,” Widmer mentions. Considering the amount of innovation present here, he has every right to boast, yet he remains modest and enthusiastic.

When machining rises to this level, it becomes something to behold.

That’s because Widmer is someone who’s put his heart, soul, and retirement fund into maintaining this market. Since Honda no longer casts these heads, Widmer felt the need to step in, create the best product possible, and provide Honda lovers with options to pursue their passion. As he enters his seventh decade and works (without the aim of making much money) to keep these engines alive, you can’t help but tip your hat to the man.

For more on Mast Motorsport’s exceptional products, visit its site here.

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About the author

Tommy Parry

Tommy Parry has been racing and writing about racing cars for the past seven years. As an automotive enthusiast from a young age, he worked jobs revolving around cars throughout high school, and tried his hand on the race track on his 20th birthday. After winning his first outdoor kart race, Tommy began working as an apprentice mechanic to amateur racers in the Bay Area to sharpen his mechanical understanding. He has worked as a track day instructor and automotive writer since 2012, and continues to race karts, formula cars, sedans, and rally cars in the San Francisco region.
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