'383' ~ 1967 325 HP vs. 1968 330 HP vs. 1968 335 HP

Looking at the "stock casting " airflow numbers...., I can see why just a good radius cutter/honest good valve job,really wakes the stock head castings up... Just wow,there was room 4 improvement.

The #2843906 Cylinder Head 'responds greatly' to even the mildest improvements.