Quote:
Originally Posted by Bobby Brannon
What engines combinations will slow down and what will pick up. Do not name any players just combinations.
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My "GUESS" is the 428 Fords, 440 mopars, Max wedge Mopars, Iron Oval Port Big Block Chebbies, Some small block 350 Chebbies, and a few others such as 360 Mopars. Your Square port version will not slow down because its almost to big already new from the factory. The Alum. replacement head on the 375/396's will slow down because they are almost like an oval port new in the box and have been "massaged" for the most part. Im sure Ive missed several but these just come to mind right off.. My opinions and they means ZIP. Have a great Holidays Bobby. P.S. Most of the power gain is in the first inch below the valve seat so its not always the size (volume) of the port but the SHAPE.