COMPATIBILITY – Fits GMP Performance V8, 265 (4.3L), 283 (4.6L), 302 (4.9L), 307 (5.0L), 327 (5.3L), 350 (5.7L), 400 (6.6L); Steel wire GET THE RIGHT PART -- Before purchasing, please check the “Amazon Confirmed Fit” bar to ensure this part will fit your vehicle; enter all vehicle information (year, make, model, engine and trim) for compatibility and check qualifier notes. If the “Amazon Confirmed Fit” bar has an “i” in a blue circle, this product has additional notes. Please hover over the “i” on the bar to see notes before making your purchase PROPRIETARY COATING -- Nonstick, non-friction coating seals small surface imperfections NO RETORQUE DESIGN -- Steel core helps eliminate the need for retorquing head bolts SUPERIOR SEAL -- Precise embossed Printoseal sealing beads at all vital areas to eliminate leak paths STRONG AND DURABLE -- Features graphite or reinforced fiber facing material and steel armor for strength and durability DESIGNED FOR IMPERFECT SEALING SURFACES -- Engineered and manufactured specifically for the repair environment to help seal imperfect sealing surfaces