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Message: <blockquote data-quote="modo" data-source="post: 1005249" data-attributes="member: 11716">the head bolts / studs going into the corners of stock 302 blocks need thread sealant as they do go into cooling passages. i highly doubt the change in timing had anything to do with causing the bolt to break. if you were rattling the motor that bad due to detonation you would have ate the head gasket or a piston and not broke a head bolt. unless you started pushing a lot more boost i doubt the heads were lifting either. i would try a easy out first and just replace the bolt. then pressurize the coolant system to make sure it keeps pressure. if you do decide to pull the heads go with studs and only have the heads decked if it is needed. as for what head gasket to use i would not use a mls gasket, just go with felpro 9333-pt1s.</blockquote>