Quote:
Originally Posted by Excaliber
While the SOHC is the top dog the 427 High Riser heads of 1964 were a close second. Those heads were outlawed by NASCAR in 1965 and the result was the medium riser heads which became quite popular as an alternative. High Riser heads COULD compete with the Hemi. Even today a well worked set of original High Riser heads are hard to beat by ANY after market or modern 427 heads.
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Dove, and I believe Blue Thunder sell "modified" Hi-Riser heads, with raised floors in the intake ports which are better than the original design I believe. However, I believe the Dove tunnel ports will still flow more than the modified Hi-Risers, but maybe not by much. The problem with the Hi-Risers and Tunnel-Ports are intake selection.