1968 Chevrolet cylinder heads 307 from 327-210HP Chevy Camaro taken from car over 25 years ago, now may need overhauling, valve size 1.72 / 1.50 combustion 69.cc matching casting # 3911032 date code E 31.8 & L 13.7 would also fit on 283 305 350 and used regular gas. These was used on Impala Bel Aire Chevelle Nova Chevy II, Malibu Pontiac, Beaumont, Acadian ,Chevy, GMC pickup truck pair $90. Ad will be deleted when item is sold.