Originally Posted by actmobmar
thanks for the input! i currently have harland sharp 1.5"s on it, and also have harland 1.65's as well, so i do have both
Good rockers. If you think there's any chance you might want to run the 1.65's, go ahead and open the pushrod holes up now, while the heads are off. I'd go ahead and check all the clearances, too just to be sure. That way all you'd need to do is swap rockers and lash the valves.
In my experience changing only the rocker ratio hasn't required a different p-rod length, but it never hurts to check to be positive. You can check for the correct p-rod length during the mock-up phase or even when the 1.65 rockers are installed by using an adjustable pushrod.
Click on image for details on making this tool:
Other homemade pushrod length checking tools at HomemadeTools.net