Remflex 12-001 Exhaust Gasket for Pontiac V8 Engine， (Set of 2)<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>1-1/8 inch width x 1-3/4 inch height D Shaped Center Ports; Pontiac V8 - 326， 350， 370， 389， 400， 421， 428， 455， Port Match to Head， Manifold or Headers， 2/Set</li><li>1-3/8 inch width x 1-13-16 inch height Oval End Ports</li><li>There are no rubber binders or composite materials in Remflex exhaust gaskets so they will not shrink or harden due to time or temperature eliminating the need to go back and continually retighten your flange bolts</li><li>Heating and cooling of the exhaust system causes header and manifold flanges to warp resulting in gaps between the head and header which Remflex exhaust gaskets seal completely due to the thickness and compressibility of the 100 percent flexible graphite</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41RrNmRHduL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41RrNmRHduL.jpg" noproxy>