3 0 1990 Mack EM6 Engine for a Mack RB688S Contact for price MACK EM6-250L ENGINE, 250HP - S/N: OB1084 ConditionUsedFits To Make(s)MACKFits To Model(s)RB688SStock Number49603 MLS Number12817112CategoryEngines Last Updated9/30/2025 LocationCrandall, TX, US Sold ByTim Jordan's Truck Parts Inc. (833) 359-___ SHOWNUMBERCall Seller Email Seller Save More Info