3811985, 3646324 Cylinder Head Improved for KT19/K38/KT50

ISLe 8.9L Cylinder Head 4942138, 4942139, 5282720, 5339588 from Factory

ISL T375 Cylinder Head 4929518, 4936714, 5348475, 5529506, 5339587

ISF3.8 Cylinder Head 5258274, 5258275 from Factory

ISF2.8 Cylinder Head 5307154, 5271177 Factory Engine Head

ISDe QSB6.7 Cylinder Head ISB6.7 Engine Head 3977225, 4936081, 5364892 from Factory TPEC

ISDe QSB4.5 Cylinder Head 4941495, 4941496, 5282708 From TPEC Factory

6CT8.3L 21"intake Cylinder Head 3936180, 3802466, 4938632,3973493, 3991152,3936152 from Factory TPEC

6B5.9 Cylinder Head 3966454, 3917287 from TPEC Factory