Related Photo Galleries
For this combination, we decided against the conventional spiral locks and ordered up the pin buttons. One of the advantages is ease of service, however, the most important thing is that these are more reliable in a high-horsepower racing application. If you’re running the fine line between the perfect tune or completely missing it, detonation will try to knock the spiral lock out of the groove. Imagine being at the upper rpm in this situation, and there’s a good chance you’ll end up shoving the pin through the cylinder bore.