INTAKE MANIFOLD KIT, BIG BLOCK CHEVY, 396, 427, 454 -- This kit includes grade 8 bolts and cup washers. I designed cup washers in the 80s, to take the place of a regular flat washer, and to in crease the holding surface of a socket head bolt. All of our parts are made of high grade 6061 T-6 aircraft, billet aluminum
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