Panic! It could be. If the points of reference, (distance from pushrod to fulcrum, distance from rocker tip to fulcrum, distance from pushrod to rocker tip) are the same you could probably use 'em. If those measurements or the the axis through the fulcrum from the pushrod to the tip are not the same, you'd have to make adjustments accordingly. Even a small variation in these measurements would require that you move the stud or the valve and change the angle of the pushrod! Very small differences might be overcome by altering overall geometry, but if one rocker is much larger or smaller than the other it would be a lot of work and or expense unless you have machine shop access!
If you can purchase the part you need to do the job, why subject yourself to so much aggravation and or expense?? I'd want to have an example of both to do a really close comparison before I'd recommend such a swap.
For example, we used the larger ratio BBC roller rockers on some of our highly modified small block engines. To do so, we had to use offset rocker studs, different pushrod guides, and we had to radically open up the pushrod holes in the cylinder heads to make room for the change.
Last edited by Blackwater; 10/07/19 09:48 PM.
