Brand new polished billet aluminum round 16 LB radiator cap. These caps are machined from billet aluminum then show polished. These are 2-7/8" total diameter. Fits most Hot Rods and classic engines including GM (CHEVY, GMC, OLDS, CADILLAC, PONTIAC, BUICK, FORD, & MOPAR (CHRYSLER, DODGE, PLYMOUTH) Fits 265 283 305 307 327 350 383 400 396 402 427 454 472 502 260 289 302 351W 347 352 360 390 406 427 428 429 460 351C 351M 400M 273 318 340 360 361 383 400 413 426W 440 455 330 326 Engines. These caps will fit most original radiators as well as all aftermarket aluminum radiators. Perfect for your off road, jeep, rock crawler, muscle car, street rod, rat rod, gasser, dune buggy, or sand rail project.