Edelbrock E-Series Cylinder Head Bolt Kit #85572 is a high-quality set of replacement bolts for use with Ford FE 390-428 heads. This kit contains all the necessary parts top replace the factory head bolts. E-Series bolts have a yield tensile strength of 190,000 PSI for strong and reliable loading with generous filleting throughout to eliminate stress risers. Bolt threads are rolled after heat-treating for superior form and strength, while a small hex head provides extra space for socket clearance in tight situations. E-Series Cylinder Head Bolts have a durable black oxide finish with sealer and come with the distinctive Edelbrock ???E??? stamped into the head.