J-Heads

915 heads can have 1.88 valves OEM in a 360 or 2.02 valves OEM in a 340 from the factory. '72 were all 1.88. They were next in line after they quit using the 894 heads. They can have a 1970 casting date because they were used for the 340-6 pack engines in 1970, just had the intake pushrod hole machined in a different location to accommodate the offset intake rockers. Castings also needed to start in '70 for '71 model year 360s.