Check the listing for details. Big Block Mopar REMFLEX 6002 Exhaust Manifold Gaskets 361 383 400 413 426 440. Condition: New. Listed at 42.39 USD. REMFLEX Exhaust Flange Gaskets - Sold as Pair Part # 6002 Fitment: Big Block Mopar 361 383 400 413 426 Wedge 440 Dimensions:1-7/8" x 1-3/8" Sqaure Port **Suggested Torque: 20 Ft/Lbs** Remflex Exhaust Gaskets are made with a Unique Flexible graphite material gaskets deliver up to 50% crush and withstand over 2,000F, eliminating burn-out and the need to re-torque. Gaskets offer superior sealing, even on exhaust header flanges that are warped or distorted. INSTALLATION TIPS: We want you to get the most from your new Remflex exhaust gaskets. To assure your complete satisfaction, please follow these basic installation guidelines: 1.) DO NOT BEND! Remflex gaskets are designed to withstand clamping force and incredible heat, but not bending. If you bend them, they will break! 2.) Do not over tighten. When properly installed the flange should be tightened evenly - See the suggested torque value range. 3.) Longer bolts aren't necessary. Though Remflex are thicker than other gaskets, standard length bolts will work fine. 4.) Do not use sealers. Silicone and other sealers cannot withstand the same temperature as Remflex gaskets, and can actually cause leaks.