i'm just following up on an old 1970 mopar article,
with respect to the #915 and #906 cylinder heads.
on a 1970 'stock' 440 gtx with 3.55 gears and automatic.
a 'brand' new gtx with nothing more than a 'general' quick performance tune-up,
ran the 'quarter-mile' at milan dragstrip at 14.11 @ 99.79 mph.
the #906 cylinder heads were pulled off and cc'd at 88.2.
swap the #906 heads for a set of stock #915 heads {w/factory cc level at 78.8}
result............ 13.78 @ 102.34 mph
gain............... {-.33 et} and {+2.55 mph}
