did 3418815 heads

I've seen some slightly inconsistent info but I believe they transitioned from 2531894 heads to 3418915 in or around 1970-'71 so certain ones did have 2.02" intakes for 340s while staying with 1.88" for 360 applications. Casting dates can provide more clues. As Mike pointed out, 915 heads were also used on 340-6 T/A & AAR E-bodies. Chrysler did have a very early run of 894 heads with offset pushrod holes but I believe that was an early run for the Trans-Am series and didn't make it onto production cars. (Another member has some photos!)