One very damage free rebuidable pair of original 1958 Chevrolet cast iron cylinder heads. Casting # 3748770 for 1958 model year. EXCELLENT stock GM set with no porting or modifications. These are the correct Flint castings for your 230 single quad, 245 270 dual quad, or fuel injection Corvette restoration since they end in a single digit number, -7- not -57-. These also have the large " X-58 " on the side of each casting. These have been in storage for 20+ years and are in gret shape just need to be cleaned and rebuilt.....very rare and hard to find umolested pair of heads......get your chance to restore your american icon. Real good castings to build. Also used on 1958 pass Chevy with power pac 283 engine with wcfb carter carb. Still 1.72 stock intake valve size & 1.50 exhaust...email me at icemanfour662005@yahoo.com for pics........there is a set on ebay right now that has been cleaned and blasted that are going for 800 and still hvae 6 days left to go up....selling these for 500 plus shipping