Ford FE 390 Engine Bolt Size and Length Head Bolts - Short Long 3" Long 1/2" Bolt 13 TPI Intake Bolts 8 Long - 2.5" Long 3/8" Bolt 16 TPI 2 Short - 1.5" Long 3/8" Bolt 16 TPI bed 1/2"-13 X 3 3/4" no bushings for stock rear cab bolts 7/16"-14 X 5 1/4" (3 1/4) front cab 7/16"-14 X 3 1/4" radiator support 3/8"-16