Plugs and Gaps
Posted: Mon Dec 07, 2009 4:18 pm
Some of you might find this thread in the Maverick Forum interesting. http://mmb.maverick.to/showthread.php?t=62386
Large plug gaps came into vogue with car makers in the late 70's and early 80's. The thinking is that the larger flame kernal would help get better emissions. Most automakers now use .030 to .040 gaps today. Even the LS series engines went to .040 after initally calling for a .060 gap. Large gaps tend to "blow out" the spark under high compression and boost. In any high perfoamnce engine, you should run the biggest gap you can that does not cause mis fires under load. From personal experience with ford performance engines, boosted engines run best around .025-.030 and high compression engines run best around .030 to .035