Eddie,
We did not have to elongate the pushrod openings. The reason is hard to put in words but...We decided on 1.65 rocker when we started the project. So we installed valves that are approx .200" longer than stock. This does two things a. Adjusts pushrod location and b. allows additional spring installed height for better spring selection. Then to achieve proper rocker geometry we needed a 9.350" pushrod which is approx .200" longer than stock. Even though the pushrod seat in the rocker arm is closer to the fulcrum than the 1.5 ratio rocker, the longer pushrod travels nearer the center of original opening. So, the longer valves alleviated interference and preserved the original castings and we have a top quality spring. Yes the pushrod is close to the original opening but still further than from the guideplates. I hope those gory details are clear enough.
Jim
|