When it comes to cylinder heads, Dart has a long and storied history as an industry leader. So, it should come as no surprise to hear that they have yet again stepped up their game with the Dart Race Series LS 10-degree 368cc CNC oval port cylinder head designed specifically for NMCA Pro Stock. As the name would suggest, they are a 10-degree head, but also feature four degrees of cant — giving you the best possible breathing room when it comes to flow and clearances.

“They started out a lot like an old Pro Stock head—with a similar design in mind,” said Tony McAfee of Dart. “The valves have been moved around to give us the best possible flow and valve geometry. The exhaust valve has been raised and the intake and exhaust valves are reversed.”

The heads are made from RMR cast aluminum alloy and are machined to accept a 2.300-inch intake valve paired with a 1.600-inch exhaust valve. As far as operating those valves is concerned, there are three separate systems all of which were designed in conjunction with Jesel and are shaft mounted.

“There are three different valve trains for the heads,” said McAfee. “There are a straight steel and straight aluminum option, but in order to run them, you have to use an offset lifter — the lifter is physically moved over .100 of an inch. However, if you’d like to run them with a stock block or standard lifter location you can use the third version which has the offset built into the rocker.”

McAfee tells us that by not using the offset lifter, you are sacrificing a couple of degrees in pushrod angle which leads to overall lower duration numbers accordingly. However, the differences are relatively marginal and will still be well worth it, even if your block does not offer an offset lifter configuration.

Again, as the name conveys, the intake ports are a raised Pro Stock style, oval 368cc runner design. The heads use wedge style combustion chambers that are highly efficient and can be had in any measurement from 38 to 57cc, depending on your specifications. They are also available in a sixth fastener bolt pattern. Dual exhaust bolt patterns are also available for either standard or offset headers.

The result of the canted valves, revised intake ports, and wedge shaped combustion chamber are flow numbers that are unparalleled. We can’t wait to see what these things are capable of on the race track. For more information visit Dart’s site here.