Mopar '340-X' Heads vs. Chevy 'Fuelie Heads'
Mopar 340 'X' Heads
Casting # ...... 2531894
Years ............ 1968, 1969, 1970
Factory Combustion Chamber .... 72.0 CC
NHRA Minimum ........................ 63.5 CC
Intake Valve ............................ 2.02"
Exhaust Valve .......................... 1.60"
Intake Port Volume ................... 160 CC
Exhaust Port Volume ................... 70 CC
Intake Port Size ........................ 1.08" Wide x 2.17" Height
Exhaust Port Size ...................... 1.25" Wide x 1.75" Height
Intake Bowl Size ....................... 1.75" {86.7% of Intake Valve}
~ CFM Flow ~
Lift ....... Intake ... Exhaust
.100" ......... 60 .......... 50
.200" ........ 120 ........ 104
.300" ........ 173 ........ 131
.400" ........ 210 ........ 143
.500" ........ 218 ........ 145