Header Information Update for EFI Engine Build Sheets
#39886 from American Sedan Committee · Rule change · TB 26-04 (2026-04 Fastrack)
In AS EFI Engine Build Sheets, add to notes as follows:
GM LS1, LS2, LS6: "Any three stage dry sump is permitted. 1-3/4” diameter headers permitted."
GM LS3, LT1: "Any three stage dry sump is permitted."
Ford 4.6L 2V and Ford 4.6L 3V: "Headers as specified in the Full Prep American Sedan rules may be used. Ford Performance
camshaft kit P/N M-6550-3V may be used."
Ford Gen 1, 2, and 3 5.0L: "MMR Secondary Timing Chain Tensioner Bracket #467893 is permitted."
Mopar 5. 7L and 6.1L: "1-3/4” diameter headers permitted."