MERCRUISER : 4.3L MPI ALPHA/BRAVO Model Serial Ranges 0M300000 THRU 0M614999 0M615000 THRU 0W309999 0W310000 THRU 0W649999 0W650000 THRU 0W658582 0W658583 THRU 0W658583 0W658584 THRU 1A030367 1A030368 THRU 1A030369 1A030370 THRU 1A063239 1A063240 & Up
