'383' ~ 1967 325 HP vs. 1968 330 HP vs. 1968 335 HP
Find the 5 Horsepower Difference
1967 ~ 383/325 HP ........................... 1968 383/330 HP {'Base' 383 4-Barrel}
325 HP @ 4800 RPM's ........................ 330 HP @ 5000 RPM's
Cylinder Heads .... #2406516 ............. #2843906
Intake Valve ........ 2.08" ..................... 2.08"
Exhaust Valve ...... 1.60" ..................... 1.74"
Intake Manifold ... #2205968 ............... #2806301
Height ................ 2.80" ...................... 3.44"
Branch Length..................................... 10% Greater Length
Runner Volume ................................... 50% Greater CC Volume
Carburetor ........ AFB .......................... AVS
CFM Rating ....... 566 .......................... 630
Primary ............ 1 7/16" ..................... 1 7/16"
Secondary ........ 1 9/16" ..................... 1 11/16"
Air Cleaner ....... 'Unsilenced' ................ 'Dual Snorkel'
Exhaust Manifold ... #2532626 {L} ........ #2843992 {L}
Exhaust Manifold ... #2532464 {R} ....... #2532464 {R}
Header Outlet Size . 2.25" {2 1/4"} ...... 2.25" {2 1/4"}
Note; The Driver-Side Exhaust Manifold for the 1968 Models was improved,
with a 'wind-swept design' with less-restrictive bends which improved
exhaust flow by 40%.
Tail Pipes .............. 2.00" .................... 2.25"
Fan ..................... 4-Blade .................. 7-Blade
Diameter ............. 17" ........................ 18"