1968 - 1971 {340} Casting #2531984 'X-Heads'
Open-Shaped Combustion Chamber
Factory CC Level..........................65.0 to 68.0 CC's
Recommended Minimum CC's......63.5 CC's
Intake Gasket Port Size..............1.16" x 2.27"
Exhaust Gasket Port Size............1.25" x 1.75"
Intake Valve..............................2.02"
Exhaust Valve............................1.60"
Intake Bowl Size........................1.75" {87% of Valve}
Intake Port Size........................160 CC
Exhaust Port Size.......................70 CC
Intake Flow.............................215 CFM @ .450" Lift
Exhaust Flow...........................140 CFM @ .450" Lift
Intake-to-Exhaust Flow...........65.5%
