Edelbrock E-Series Cylinder Head Bolt Kit #85332 is designed for use on Jeep 4.0L inline six-cylinder engines using ½-inch head bolts. This high-quality E-Series bolt kit will pair perfectly with Edelbrock’s Jeep Cylinder Head #50159 and #50169 and will also fit the 4.2L inline six-cylinder engine if using Edelbrock heads. 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.