EngineQuest 318B Cylinder Head
*Stock with 1.92-/1.625-inch valves
**Modified with 2.08-/1.600-inch valves
417ci Mopar Small-Block
EngineQuest's Magnum heads (PN 318B) and its LA-Series counterpart (the 318A) are iron replacement-style cylinder heads designed to bolt in place of tired or cracked originals. Fortunately, EngineQuest invested the effort to substantially improve on the factory design through a process of detail refinement rather than radical design changes. What results is a head that does double duty, serving as an economical replacement for OEM, while supporting the needs of a low-cost mild performance unit. The heads are cast in Australia, using a technique that produces an exceptionally smooth port surface for more flow and power, with 172cc intake runners and 62cc combustion chambers. In box-stock form, these heads offer superior quality at an affordable price with no additional machining, porting, or polishing required.
While the EngineQuest heads represent a bolt-on upgrade to a stock cylinder head, there is always room for improvement with custom porting work and modification. SKMFX explored the potential of these heads with a determined development effort to see how much airflow could be unlocked from these modest castings. The results were dramatic, as seen in the flow table below. While the modified flow numbers from SKMFX are among the best we have ever seen for a production-style head, the "as-cast" flow numbers are also very impressive. This range of flow numbers represent the potential on tap, depending upon the level of modification performed. For more information about EQ's Magnum Cylinder heads, call 800-426-8771 or log on to www.EngineQuest.com.