These revisions will be in effect for the 2008 season
Cylinder head: Two spark plugs per cylinder on all 4-valve engines permitted.
Oil-retention device: NHRA-accepted lower engine oil-retention device, or a belly pan constructed of an NHRA-accepted composite material or of minimum .032-inch aluminum, with no holes, and vertical walls at least 2 inches. Minimum number of slots or holes in the walls to clear frame or lines permitted. Front and rear walls must be “coved” toward oil pan a minimum of 1/2-inch to assist oil in staying within the confines of the oil-retention device. Pan must be attached at a minimum of three attachment points per side. A nonflammable, oil-absorbent liner located inside of retention device mandatory.