Better Airflow - Port and Polish Harley Davidson Heads
Deciding to port and polish Harley Davidson heads is usually the moment a rider stops just "maintaining" their bike and starts actually building it. It's one of those classic performance moves that has been around since the early days of hot-rodding, and for a good reason. If you've already swapped your exhaust and tossed on a high-flow air cleaner but still feel like the bike is hitting a wall in the mid-to-upper RPM range, the bottleneck is almost certainly sitting right there in the cylinder heads. ...