These Proform header bolts are the last set of header bolts you will ever need. Permanently assembled with a pair of special washers that bite into and grip the bottom of the bolt head and the top surface of the header flange (when torqued to 28+ ft-lbs) these bolts will never come loose. Why? After being locked in place any bolt loosening rotation is blocked by a wedge-locking action created by the washers interfacing, matching cams. Any vibration that would normally cause the bolts to loosen actually increases the tension even more and where oil used to be the enemy, with these oil actually helps the wedge effect. Danchuk # 17804 will work on any 1955-1957 classic Chevy with a small block V8 as well as other vehicles you may have in your collection. Set of 12. Measures 3/8" x 3/4"".
Danchuk has the largest selection of quality 55, 56, 57 parts for your classic Chevy project.