Match Race ~ 1970 'Duster 340' vs. 1969 Mustang 'Mach 1' 351W

1969 351W

Cylinder Heads......... #C90E-G

Regarded as the 'best' flowing stock Cylinder Head for the 289/302/351W.

Intake Valve................. 1.852"
Exhaust Valve............... 1.548"

Intake Port Size............. 1.94" x 1.04"
Exhaust Port Size........... 1.24" x 1.00"

Intake Runner Volume..... 140 CC's
Exhaust Runner Volume.... 55 CC's

Intake Port Flow.............. 173 CFM @ .450" Lift
Exhaust Port Flow............ 114 CFM @ .450" Lift

Combustion Chamber...... 'Closed'
Factory.......................... 60.4 CC's
Minimum....................... 58.9 CC's

* Good flowing Heads for Street Performance Engines.
* Narrow runners provide good bottom-end torque and mid-range power.
* Restricted flow at high RPM's.
* Thermoactor-hump in the exhaust port restricts flow.