Edelbrock E-Series Cylinder Head Bolt Kit #85612 is designed for use on Pontiac engines with Edelbrock Performer #61569, #61579 and #61599 D-Port Cylinder Heads. This kit contains all the necessary parts to replace the factory head bolts. E-Series bolts have a yield tensile strength of 190,000 PSI for strong and reliable loading. 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.