Select your Engine Type 2.8 LO 2.8 HO 2.8 Alum Head 2.8 VVT 3.1 Iron Head 3.1 Alum Head 3.4 Iron Head 3.4 DOHC (91-95) 3.4 DOHC (96-97) 3100 3400 3500 3500 VVT 3900 3900 VVT NOTE : Some engines' data has not been added yet. This is mainly limited to the newer engines, but also currently includes the DOHC engines. Select your Overbore Size Stock/None 0.020" 0.040" 0.060" 0.080" 0.100" 0.120" Miscellaneous Notes Please add any notes you would like to include for this calculation: